The UK’s push to decarbonise homes is accelerating, and air source heat pumps (ASHPs) are central to that mission. With gas boilers set for phase-out by 2035 and energy prices fluctuating, thousands of UK homeowners are switching to heat pumps to make their properties sustainable and future-proof.
The shift is underway: the UK aims to install 600,000 heat pumps per year by 2028, following Europe’s lead in replacing gas systems with low-carbon alternatives. With the UK’s Net Zero target legally locked in for 2050, the clock is ticking to adopt sustainable heating solutions.
ASHPs offer a step-change in efficiency, delivering 300–400% more heat per kilowatt of electricity than a traditional boiler. Backed by the £7,500 Boiler Upgrade Scheme, they’ve never been more accessible.
From Victorian terraces to a modern new-build, retrofitting a heat pump is an energy upgrade — the next evolution of sustainable living.
What is an air source heat pump?
An air source heat pump (ASHP) is a highly efficient, low-carbon heating system that draws heat from the outside air — even in winter — and transfers it into the home to warm radiators, underfloor heating, and hot water. This is an environmentally friendly way of heating UK Homes.
Think of it like a fridge in reverse. Instead of using gas to generate heat, ASHPs use electricity to transfer renewable heat from outdoors to indoors, making them a cleaner, smarter alternative to traditional boilers.
With every 1kW of electricity used, a homeowner will get 3-4kW of heat, compared to a gas boiler’s measly 90%. This works well in freezing days — modern ASHPs operate efficiently across a wide range of temperatures, including sub-zero conditions down to -15°C or even -25°C.
Why retrofit an air source heat pump?
Most UK homes built after 1920 — even older cottages — can be retrofitted with an air source heat pump (ASHP). If a gas boiler is nearing the end — or sky-high energy bills — now is the ideal time to consider switching.
ASHPs are a practical, future-proof solution for cutting energy costs and reducing carbon emissions. With heating responsible for 14% of the UK’s carbon footprint, the government is backing adoption through initiatives like the Boiler Upgrade Scheme.
While new builds are designed for low-carbon tech, existing homes require a tailored approach. They face unique challenges in ASHP installation. Understanding the retrofit process is key, especially when replacing an old boiler.
Retrofit Tip: From Victorian terraces to 1990s semis, many UK homes are ready for ASHPs. If a homeowner is upgrading their heating system, it’s a perfect time to retrofit an ASHP.
How do air source heat pumps work?
Air source heat pumps (ASHPs) capture natural heat from outdoor air — even in winter — and transfer the heat generated into water using electricity. In the UK, there are two main types:
- Air-to-water heat pumps: The most common choice for UK homes. These systems absorb heat from the outside air and transfer it to a refrigerant fluid, which boils at low temperatures. This fluid is then compressed, boosting its temperature, and the heat is transferred into your home’s central heating via radiators or underfloor heating. They also provide hot water through a storage cylinder, making them ideal for both space and water heating.
- Air-to-air heat pumps: Less common in UK homes, these systems heat air directly without using a water-based system. They draw warmth from the outdoor air and deliver it indoors through fan units, providing fast and efficient heating for open-plan spaces or zoned comfort.
| ASHP Type | Best for |
| Air-to-water heat pumps | Homes with existing wet heating systems |
| Air-to-air heat pumps | Properties without traditional radiator systems |
What makes homes ready for an ASHP Retrofit?
Not every home is ASHP-ready — yet. However, with the right preparation, countless UK properties can benefit. Key suitability factors include:
1. Insulation: The Make-or-Break Factor
To maximise the efficiency of an air source heat pump, insulation is critical, particularly in three key areas: the loft, walls, and floors. ASHPs run at lower temperatures than gas boilers, so reducing heat loss is essential.
Loft insulation alone can save homeowners between £350 and £455 per year. For optimal performance, loft and cavity wall insulation should be at least 270mm thick. In homes without cavities, solid wall insulation — internal or external — is vital for reducing heat loss.
For older properties with suspended timber floors, underfloor insulation can make a significant difference, improving comfort and energy performance throughout the home.
2. Radiators: Size Matters
Older radiators often struggle to deliver sufficient heat at the low flow temperatures required by ASHPs. For optimal performance, they may need to be upsized — 2½ times larger — or replaced with low-temperature models or underfloor heating (UFH). A balanced approach may include retaining a single high-temperature radiator in the bathroom for quick, focused warmth.
ASHPs work well with hybrid systems — such as radiators downstairs and UFH upstairs — enabling zoned heating and making the most of the system’s lower operating temperatures. This setup boosts efficiency while maintaining comfort throughout the home.
3. Outdoor and Indoor Space: Location Requirements
Installing an air source heat pump (ASHP) requires thoughtful planning around space and airflow. UK homeowners need 1–2 m² of well-ventilated outdoor space for the external unit — ideally positioned at least 3 metres away from neighbouring properties to minimise noise impact.
Indoors, space is needed for a hot water cylinder or hydro unit. These systems also require good airflow; hence, they shouldn’t be boxed in or enclosed, as restricted ventilation can reduce efficiency. Proper placement is essential to ensure the system operates efficiently and delivers long-term performance.
4. Electrical System: Don’t Get Caught Out
Older UK homes often require consumer unit upgrades or dedicated circuits installation before installing an air source heat pump (ASHP). A qualified electrician will assess the system during the planning stage to ensure safety and compliance.
If a property has an outdated fuse box — such as rewirable fuses without RCD protection — or old-style wiring like rubber or fabric-insulated cables. These are clear signals that an upgrade is needed, as they may not meet modern safety standards.
Modernising the electrical system ensures compatibility with ASHPs and enhances overall performance.
5. Hot Water Demand: Tank vs. Tankless
Before installing a heat pump, UK homeowners should assess whether there’s adequate space for a hot water cylinder or explore compact solutions if space is tight. Standard cylinders are ideal for households that use 200 litres of hot water and are well-suited for families.
For smaller homes, compact heat pump cylinders are available, though they may come at a higher upfront cost.
Importantly, most UK homes are more suitable than they might appear. Even complex properties can accommodate heat pump installations with the right system design, using solutions such as hybrid setups or infrared backups. The key is to seek professional guidance to tailor the most effective approach for your specific home.
Retrofit Tip: Use the Energy Saving Trust’s home suitability checker or consult an MCS-certified installer for a full home assessment.
Planning ASHP Retrofit: Smart decisions before installation
Not all installations are created equal. The secret is smart planning, which makes or breaks the ASHP retrofit.
In the UK, over 60% of heat pump efficiency hinges on proper pre-installation preparation — yet many homeowners rush in unprepared. The result is higher running costs. However, with energy prices still 10% higher, cutting corners on energy efficiency and conservation isn’t an option.
1. Get a Heat Loss Calculation
Every successful retrofit begins with a room-by-room heat loss calculation. This critical step determines how much heat each house loses, ensuring the heat pump is accurately sized for both comfort and efficiency. Under-sizing risks cold winters; over-sizing leads to unnecessary energy use and higher bills.
MCS-certified installers or retrofit assessors carry out the survey using tools such as SAP or MCS-approved software. It’s also a requirement for grant eligibility under schemes like the Boiler Upgrade Scheme.
Skipping this step compromises system performance and long-term savings. A properly sized system helps meet heating demand, supports year-round comfort and low-carbon living.
2. Choosing the Right Size Heat Pump
In heat pump design, bigger isn’t better — precision is. A detailed heat loss calculation ensures the system is neither overworked nor oversized, both of which reduce efficiency.
Oversized units cause short cycling; undersized systems struggle to heat the home. The heat loss report determines the correct kW requirement — usually 6–9 kW for a standard 3-bed semi-detached home.
Air source heat pumps are available in both fixed-speed and modulating types. Modern inverter-driven models adjust their output to match demand, maximising efficiency while maintaining comfort.
3. Evaluate Emitters (Radiators or UFH)
ASHPs work best at flow temperatures of 35–45°C as compared to 65–75°C for gas boilers. Radiator upgrade is commonly used, and UFH retrofits work well in extensions or renovations. While retrofitting means:
- Upsizing the radiators
- Or installing underfloor heating
- Or combining both with zoning
| Oversized radiators | (Type 22/33) often work fine. |
| Old single-panel radiators | Old and need to be replaced with low-temp models. |
| Underfloor heating (UFH) | Designed for low temps and improves efficiency. |
Retrofit Tip: Oversized radiators = slower heat loss = greater comfort.
4. Cylinder Compatibility
To maximise efficiency, choose a heat pump-compatible cylinder with a large coil area and a minimum of 200L of water capacity, sized to match household demand. Must look for an “ASHP-rated” cylinder with extra-thick insulation to minimise standby heat loss.
For future-proofing, consider a solar-ready model that can integrate with PV panels later on. Heat pumps perform most efficiently when heating water gradually, either overnight, on off-peak tariffs or throughout the day.
Pairing the cylinder with a smart controller, such as Mixergy or Edel, allows smarter scheduling, reduces energy use, and provides greater control over hot water management.
Understanding the anatomy of an ASHP Retrofit system: What goes where?
To avoid costly mistakes, UK homeowners need to know how all the pieces fit together. A well-designed ASHP setup includes:
- Outdoor Unit – The Heart of the System: It is installed outside — on a wall, the ground, or a rooftop — with adequate airflow. It captures heat from the outside air, even in winter, and transfers it indoors to provide heating and hot water. Noise levels must be under 42 dB at a 1-metre boundary, and there should be at least 30 cm of clearance around the unit to allow proper airflow.
- Indoor Unit or Hydro Box – How Warmth Spreads: This unit is the heart of the heating system, circulating heat to radiators or underfloor heating. It connects directly to both the home’s space heating and hot water systems, and in some setups, it’s integrated with the hot water cylinder in a single compact cabinet.
- Hot Water Cylinder – Homeowner’s On-Demand Supply: This unit stores domestic hot water, located in an airing cupboard or utility room. ASHPs heat water gradually but efficiently, making proper storage essential. In space-limited homes, hybrid or combi-style heat pumps may be considered, though they’re less common in UK retrofits.
- Buffer Tank – Sometimes Needed: A buffer tank helps stabilise pressure, reduce short cycling, and extend the life of the system, especially in retrofits with variable heat loads or multiple heating zones. It is installed near the cylinder or ASHP, and it balances heat demand, making it particularly useful in well-insulated homes with intermittent heating requirements.
- Smart Controls – The Brain of the System: Smart thermostats such as Tado or Heatmiser enable zonal control and real-time efficiency monitoring. Wall-mounted or app-based, they optimise heating schedules, respond to weather changes, and help maximise savings through off-peak electricity use.
The outdoor unit extracts heat from the air and uses a refrigerant cycle to amplify it before transferring the heat indoors. A heat exchanger then heats water for radiators, underfloor heating, and the hot water cylinder.
Smart controls optimise flow temperatures based on outdoor conditions and demand, while a buffer tank (if installed) helps stabilise the system for smoother and more efficient operation.
Step-by-Step: The air source heat pump (ASHP) installation process
What a standard installation looks like:
Step 1: Initial Survey
A successful installation starts with a detailed site survey by an MCS-certified installer. This includes a full room-by-room heat loss calculation to correctly size the heat pump, assess radiator or underfloor heating compatibility, and check the property’s electrical capacity.
The installer also conducts a space audit to determine the ideal locations for the outdoor unit and internal components, ensuring the design meets both performance requirements and UK Building Regulations.
Step 2: Planning and System Design
Following the survey, the installer develops a tailored system design, providing a clear roadmap for a smooth and efficient retrofit. This stage includes:
- A detailed specification outlining the selected heat pump model, cylinder type, control system, and any radiator or underfloor heating upgrades.
- A transparent quote breaking down all costs, including equipment, installation, and any additional works such as electrical upgrades or radiator replacements.
- A comprehensive project timeline, covering installation, testing, and final commissioning.
This design ensures homeowners know exactly what to expect — technically, financially, and logistically.
Step 3: Preparing the Site
With the system design finalised, preparations begin to ensure a smooth installation. This stage may include:
- Scaffolding or equipment setup, if external pipework is required along walls or roofs.
- Clearing indoor areas to accommodate the hot water cylinder, buffer tank, or radiator upgrades.
- Temporary adjustments — such as relocating furniture, protecting flooring, or securing pets during work.
Installers will provide clear guidance 1–2 days before installation, helping UK homeowners understand what to expect and minimise disruption.
Step 4: System Installation
Over 2–5 days, the installer completes the system installation with precision and care. Key tasks include:
- Fitting the outdoor unit, mounted on a ground stand or wall bracket, with proper vibration isolation.
- Installing indoor components, such as the hot water cylinder and buffer tank (if required).
- Running insulated copper pipework to connect the heating and refrigerant circuits.
- Completing electrical work — wiring the heat pump to a dedicated circuit for safe operation.
Each step is thoroughly checked, with all connections sealed, insulated, and leak-tested before moving to commissioning.
Step 5: Electrical and Plumbing Work
This phase brings the system to life, combining precise plumbing and electrical work to ensure safe and efficient operation. The installer does different work, such as:
Plumbing Work:
- Securely mount the outdoor unit using vibration-dampening brackets.
- Install insulated refrigerant lines between outdoor and indoor units.
- Connect to the home’s heating distribution system (radiators or UFH).
- Install and plumb in the ASHP-compatible hot water cylinder.
- Implement hydraulic separation if a buffer tank is included.
Electrical Work:
- Connect the ASHP to a dedicated circuit from the home’s consumer unit.
- Install isolator switches to support safe future maintenance.
- Upgrade the consumer unit or fuse box where necessary, especially in older homes.
- Integrate smart controls, thermostats, and weather compensation systems.
Every detail is executed to manufacturer and MCS standards, ensuring long-term performance, safety, and warranty compliance.
Step 6: Commissioning and Handover
The final stage brings the system to life through a detailed commissioning process. The installer:
- Pressure tests all pipework.
- Balances the heating system for optimal efficiency.
- Configures smart controls and schedules tailored to the property.
The homeowner receives a complete demonstration of a new system’s operation and maintenance requirements. The process concludes with essential paperwork: the installer registers the warranty and submits the MCS certificate, required for eligibility under UK government grant schemes.
How to integrate ASHP with existing radiators or Underfloor Heating?
Retrofitting an air source heat pump (ASHP) in a UK home requires careful adaptation of existing radiators or underfloor heating (UFH).
1. Radiator Upgrades
Radiators must be correctly sized to deliver more heat at lower flow temperatures — usually 40–45°C. Larger surface areas improve efficiency, making them essential for heat pump systems. Tools like the Heat Geek radiator calculator can support accurate specifications.
The most considerable compatible radiators are as follows:
| Radiator Type | Suitability for ASHPs | Key Considerations |
| Type 21/22 (Double/Triple Panel Convectors) | Often suitable | Must be correctly sized using heat loss calculations. Larger surface area improves low-temp performance. |
| Oversized Radiators | Mostly compatible | High thermal mass retains heat well, but check flow rate requirements. |
| Fan-Assisted Radiators | Ideal for low temps | Electric fans boost heat output at 35–45°C. Saves space but uses minimal electricity. |
2. Underfloor Heating (UFH) Integration
No changes are needed if underfloor heating (UFH) already exists. In retrofits, electric UFH systems can also be a viable option. UFH pairs well with air source heat pumps, as both operate efficiently at low flow temperatures (around 35–45°C).
Before installation, ensure the existing manifold and pump are compatible; older systems may need upgrades. It’s also important to assess floor insulation levels, as poor insulation can cause unnecessary heat loss and increase running costs.
3. Mixed Systems
Zoning thermostats are essential when combining underfloor heating (downstairs) with radiators upstairs — a common setup in UK homes. Integrating both with an air source heat pump (ASHP) requires careful system design.
Smart zoning allows different temperature settings for each area or even room-by-room control. Solutions like Hive or Honeywell Evohome manage this seamlessly, optimising comfort and efficiency.
In large or complex properties, hybrid setups may be used — such as one ASHP dedicated to UFH and another for radiators — but these are specialist installations.
Overcoming common challenges in ASHP Retrofits with smart solutions
- Limited Outdoor Space: Opt for monobloc units with a smaller footprint. Install at the side or rear elevation with acoustic fencing if needed. Compact vertical or wall-mounted units can suit tighter sites.
- High Hot Water Demand: Use a high-recovery cylinder and consider PV diverters for solar-assisted heating. Zoning and booster pumps can help maintain flow and efficiency.
- Electrical Limitations: Older properties may require upgrades such as a new fuseboard (£500–£1,000), a single-to-three-phase converter, or even battery storage to manage peak loads.
- Finding a Trusted Installer: Always choose an MCS-accredited installer. Request reviews and case studies, and obtain multiple quotes to ensure quality and transparency.
- Noise Sensitivity: Select ultra-quiet models — below 40 dB(A) at 1 metre — and avoid placing them near echo-prone walls.
- Poor Insulation: Follow a fabric-first approach — improve loft insulation and airtightness before installing a heat pump for best performance.
Maintenance and smart optimisation of the ASHP system
Air source heat pumps are low maintenance, but not maintenance-free. Regular upkeep is essential to ensure long-term performance and efficiency. An annual service is recommended, alongside simple homeowner tasks such as cleaning the outdoor grille every 3–6 months and checking for debris around the external unit.
Monitoring system flow temperatures becomes especially important when integrated with solar PV, helping optimise energy use across the home. Smart controls can also support efficiency by managing heating zones and improving the Seasonal Coefficient of Performance (SCOP).
To track system health, homeowners should monitor key indicators monthly:
- Coefficient of Performance (COP) should remain at ≥5.09 at 35°C flow temp.
- Defrost cycles typically occur every 30–90 minutes.
- Flow-return temperature difference (ΔT) should be between 5–10K.
Advanced smart controls — such as Hive, Tado°, or Mixergy — can further enhance performance through AI learning, geo-fencing, and adaptive scheduling.
By establishing a simple maintenance routine and using intelligent controls, UK homeowners can keep their system efficient, reliable, and future-ready.
| Task | Frequency | Key Actions | Performance Impact |
| Filter Cleaning | Monthly | Wash and replace the air intake filters | Maintains COP |
| Outdoor Unit Check | Quarterly | Clear debris (leaves, pollen), check anti-vibration pads | Prevents airflow restriction and noise issues |
| System Pressure | Bi-annually | Check hydraulic pressure (1-1.5 bar), top up inhibitor if needed | Avoids pump strain & corrosion |
| Professional Service | Yearly | MCS-certified check: refrigerant levels, electrical safety, control calibration | Ensures a 10-15-year lifespan |
ASHP Retrofit readiness checklist
To quickly assess if your home is heat pump-ready or not, answer Yes or No to these key questions:
- Do you have a plan to insulate your loft, walls, and floors effectively?
- Is there space outdoors for a unit with clear airflow (e.g. not boxed in)?
- Do you already have — or intend to install — a hot water cylinder?
- Is your loft insulation at least 270 mm thick? (UK Building Regulations Standard)
- Are your external walls cavity-insulated or solid with added insulation?
- Are your radiators already compatible, or can they be upgraded if needed?
- Are you eligible for the Boiler Upgrade Scheme (£7,500 grant)?
- Have you contacted an MCS-certified installer for a heat loss assessment?
- Can you accommodate 2–5 days of installation work?
Cost breakdown: How much does an ASHP cost?
Understanding what influences the cost of an ASHP retrofit helps UK homeowners plan their budget effectively. Based on insights from Checkatrade, the Energy Saving Trust, and Renewable Energy Hub, here are the pricing:
| Heat Pump Type | Cost | Grant Availability |
| Air-to-air | £2,000 – £4,000 | Available |
| Air-to-water | £5,000 – £9,000 | Not Available |
| Ground Source Heat Pump | £17,500 | Available |
Factors affecting air source heat pump installation costs in the UK are:
- Type of Heat Pump System: In the UK, the two main heat pump types are Air Source and Ground Source. Air Source Heat Pumps (ASHPs) are easier to install and suitable for most homes. Ground source heat pumps (GSHPs) offer higher efficiency but require substantial outdoor space for ground loops or boreholes.
- Property Size and Heat Demand: Larger homes often need higher-capacity heat pumps and may require additional radiators or underfloor heating. Older or poorly insulated properties require fabric efficiency upgrades first, which add to the overall retrofit cost but are essential for long-term performance.
- Insulation and Retrofit Work: Loft insulation, cavity wall insulation, and double glazing are often necessary with heat pump installation. While they add to upfront costs, these measures are essential for maintaining heat and ensuring the system runs efficiently. Without proper insulation, homes lose heat quickly, making heat pumps far less effective and economical.
- Installation Complexity: Ground Source Heat Pumps with boreholes tend to be more expensive due to specialised drilling. In flats or terraced homes, additional challenges may arise, such as limited space for units, planning permissions, or compliance with MCS installation standards. Proper planning and expert guidance are essential for successfully navigating these constraints.
- Location Within the UK: Labour rates vary across the UK — higher in London and the Southeast, and more competitive in regions like Northern England and Wales. Factoring in regional pricing is important when budgeting for a heat pump retrofit.
- Manufacturer and Product Quality: Premium brands such as Daikin come at a higher upfront cost but offer stronger warranties (up to 7 years) and higher efficiency ratings (COP 3.5–5). Lower-cost systems may reduce initial spend but often come with trade-offs in long-term support, part availability, and performance reliability within the UK.
- Hot Water Requirements: UK households with high hot water demand may require a larger heat pump, a 200–300L hot water cylinder, and a backup immersion heater to meet daily usage needs.
- Planning Permission or Listed Buildings: In most cases across England, heat pump installations fall under Permitted Development Rights. However, listed buildings, conservation areas, and properties in Wales, Scotland, or Northern Ireland may require additional planning permissions, potentially leading to delays and added costs. It’s important to check local authority requirements early in the process.
Retrofit Tip: An EPC rating affects both installation costs and heat pump performance. Homes rated D or below often require insulation upgrades.
UK Grants for ASHP installations
1. Boiler Upgrade Scheme (England and Wales)
To qualify for the Boiler Upgrade Scheme in England or Wales, homeowners need to be replacing an existing fossil fuel system — such as a gas, oil, or electric boiler—with a low-carbon alternative like a heat pump.
The property must be located in England or Wales, whether a homeowner, small landlord, or business. A valid Energy Performance Certificate (EPC) is required, with no outstanding recommendations for loft or cavity wall insulation.
Installations must be completed by an MCS-certified installer, who will also manage the application on behalf of the owner. The scheme, administered by Ofgem, runs until 2028 and provides up to £7,500 to support the transition to low-carbon heating.
2. Home Energy Scotland (Scotland only)
In Scotland, homeowners can access grants of up to £7,500 — or £9,000 for rural properties — through the Home Energy Scotland scheme. Interest-free loans are also available to help cover additional installation costs.
The scheme supports owner-occupied and some privately rented homes that meet minimum energy efficiency standards. Applications are submitted via the Home Energy Scotland portal.
Administered by the Energy Saving Trust and funded by the Scottish Government, this support is designed to make low-carbon heating more accessible across Scotland.
3. Nest Scheme (Wales only)
In Wales, the Nest scheme offers fully funded energy efficiency upgrades — including air source heat pumps — for eligible households.
To qualify, the owner must live in Wales, have a home with poor energy performance, and either receive means-tested benefits or have a health condition affected by cold temperatures.
Applications can be submitted directly through the Nest Wales website. This government-backed scheme is designed to enhance comfort, minimise energy bills, and make low-carbon heating accessible to everyone.
| Country | Grant/Scheme Name | Amount | Notes |
| England & Wales | Boiler Upgrade Scheme | £7,500 | Paid to the installer, a valid EPC is needed |
| Scotland | Home Energy Scotland | Up to £9,000 | Grants + loans, rural uplift available |
| Wales | Nest Scheme | Full funding | For low-income or vulnerable households |
4. ECO4 Scheme
The ECO4 (Energy Company Obligation 4) scheme is the UK government’s flagship programme for improving home energy efficiency and tackling fuel poverty. Running from April 2022 to March 2026, it requires major energy suppliers to fund energy-saving upgrades for eligible homes across Great Britain.
This includes fully funded Air Source Heat Pumps (ASHPs), complete with installation and smart heating controls. Grants can cover the entire cost, often ranging from £7,000 to over £20,000 per household.
ECO4 follows a whole-house retrofit model, pairing heat pump installation with essential insulation upgrades such as loft or cavity wall insulation — maximising efficiency and long-term energy savings.
The benefits of retrofitting an ASHP
- Cut heating bills: Save £300–£700/year if replacing oil or electric heating.
- Reduce emissions: Cut carbon footprint by 40–60%.
- Works with Solar PV: Pairs an ASHP with solar panels to reduce electricity reliance.
- Future-proof home: Avoid boiler bans and add value.
- Improved indoor air quality: Eliminates combustion and allows integration with mechanical ventilation for healthier indoor environments.
- Increase EPC score: A better EPC means better mortgage deals and resale value.
- Comfort control: Smart thermostats and zoning make it easy to fine-tune.
- Low maintenance: Requires minimal servicing compared to gas boilers, with low carbon monoxide leaks.
Finding the right installer: Trust the professionals
Choosing the right installer is key to a successful heat pump retrofit, and accessing government grants. Only MCS-certified installers are eligible to access UK grants and ensure the heating system meets industry standards.
When selecting an installer, make sure they:
- Are MCS-certified.
- Provide references from similar retrofit projects.
- Conduct a comprehensive heat loss survey and provide a detailed quote.
- Offer a clear breakdown of design, parts, and labour costs.
- Include warranty coverage, 2–5 years minimum on labour.
- Offer a maintenance contract.
- Provide a post-installation support and service plan.
Quantum Training: Learn the systems behind the tech
Quantum Training provides hands-on Training Bays and live Demonstration Units designed for installers, engineers, and informed homeowners who want to deepen their understanding of air source heat pump (ASHP) systems. Whether planning multiple retrofits or working with local contractors, our ASHP Training Bays deliver real-world experience.
What is Quantum’s Air Source Heat Pump Training Bay?
Each bay is a fully operational, live working system that offers practical training across key areas, including:
- Installation and commissioning of ASHP units.
- System diagnostics, maintenance, and fault finding.
- Techniques to optimise heat pump performance and efficiency.
- Understanding integration with different building heating systems.
- Integration with a range of heating systems (radiators, underfloor, volumizers, etc.)
Learners engage directly with complete system setups — including pre-plumbed components, piping, circuitry, valves, and controls — to gain future-ready skills for the low-carbon and renewable energy sector.
Final Thoughts
Retrofitting an air source heat pump is one of the most effective ways to reduce emissions, cut energy bills, and future-proof homes. With careful planning, the long-term benefits — both financial and environmental — are significant.
In a world of rising gas prices and growing government incentives, now is the ideal time to invest in low-carbon heating. It’s a smart upgrade that delivers comfort, control, and climate impact.
Make the shift from draughty to efficient — start your retrofit journey today.
FAQs
What educational resources and support are available for professionals and installers?
There is growing recognition of skill gaps in retrofit work, particularly in the installation of air source heat pumps (ASHPs). Quantum Training addresses this by offering detailed guides, case studies, and hands-on Training Bays — equipping professionals with the practical skills needed to work with low-carbon technologies.
How reliable are retrofit ASHP systems in practice?
Retrofit ASHP systems provide consistent warmth, reliable hot water, and easy-to-use controls, all with minimal disruption. Long-term performance, however, depends on quality installation and a future-ready workforce.
Which retrofit combinations deliver the best energy savings and carbon reduction?
The most effective outcomes come from a whole-house approach — pairing ASHPs with insulation measures, draught-proofing, and efficient heat emitters such as underfloor heating or appropriately sized radiators.
What should professionals focus on during retrofit installations?
- Bespoke system design: Start with a thorough heat loss assessment and tailor systems to each property’s needs.
- Skill development: Develop expertise in diagnostics, maintenance, and troubleshooting to ensure optimal system performance.
- Holistic service: Combine ASHPs with existing systems to deliver a complete, seamless retrofit experience for clients.
Will retrofitting an ASHP save money?
Savings depend on the system being replaced and the home’s readiness. Replacing oil or electric systems typically offers greater cost reductions, especially when paired with proper insulation and correctly sized heat emitters.
Can an existing UK home be retrofitted with an ASHP?
Yes. ASHPs can be successfully installed in a wide range of properties — from historic buildings to modern homes — by designing a system that aligns with each home’s unique heating requirements.
