Heat Pump Services
Air Source Heat Pump Installation
Full air-to-water heat pump design, supply and installation across Northamptonshire. We survey, size and fit your system, then handle the grant so you only pay the balance.
MCS-Certified Installers
Grant eligible installs
£7,500 BUS Grant
Applied to your quote
0% VAT
On qualifying work
Local Engineers
Northamptonshire based
How air source heat pump installation works
An air source heat pump replaces your gas, oil or LPG boiler with a system that extracts heat from outside air, even in winter, and concentrates it to warm your radiators, underfloor heating and hot water. Because it moves heat rather than burning fuel, a well-designed system delivers three to four units of heat for every unit of electricity it uses. The result is lower carbon heating and, in many homes, lower running costs than oil or LPG.
Getting that efficiency depends entirely on the quality of the installation. A heat pump sized by guesswork, or fitted to radiators that are too small, will struggle and cost more to run. Our process is built to avoid that.
Our installation process, step by step
1. Free home survey and heat loss assessment
We visit your property and measure the heat loss of each room, taking account of insulation, window types, room sizes and how you use the space. This is the single most important step. It tells us exactly how much heating power your home needs on the coldest days, so the heat pump is sized correctly rather than over or under specified.
2. System design and quote
Using the survey data we design a complete system: the heat pump model and output, the hot water cylinder size, any radiator upgrades, and the pipework route. You receive a clear fixed quote showing the full price, the £7,500 grant deduction and the balance you pay.
3. Grant application
We submit your Boiler Upgrade Scheme application and check eligibility for ECO4 and council funding. The grant is deducted from your invoice, so you never pay the full amount and wait for a refund. See our grants and funding page for the full list.
4. Installation
Our engineers remove your old boiler, fit the outdoor unit and cylinder, make any agreed radiator changes and connect the controls. Most installations take one to three days. We protect your home, work tidily and keep disruption to a minimum.
5. Commissioning and handover
We fill, pressure test and balance the system, set the weather compensation controls for your property, and walk you through how everything works. You receive your MCS certificate and manufacturer warranty registration on completion.
What does it cost?
Pricing depends on your property, but the ranges below are typical for Northamptonshire homes in 2026:
| Property | Before grant | After £7,500 BUS grant |
|---|---|---|
| Two bed terrace or flat | £8,000 to £10,000 | £500 to £2,500 |
| Three bed semi | £10,000 to £12,500 | £2,500 to £5,000 |
| Four bed detached | £12,000 to £14,000+ | £4,500 to £6,500+ |
All qualifying installations attract 0% VAT until at least March 2027. For a full breakdown of system, install and running costs, read our 2026 heat pump cost guide.
Is your home suitable?
Most Northamptonshire homes are suitable, from Victorian terraces in Northampton town centre to 1930s semis and modern estates. What matters is reasonable insulation, space outside for the unit, and radiators that can be sized to run at lower temperatures. Where a property is not quite ready, we can recommend a hybrid system that pairs a heat pump with your existing boiler. Not sure? Read is my house suitable for a heat pump?
Why choose Northants Heat Pumps
- MCS-certified installers, which is required to access the grant and protects your warranty.
- Local engineers based in Northamptonshire, not a national subcontractor network.
- Proper heat loss surveys, not rule-of-thumb sizing.
- We help with every grant application on your behalf.
- Work carried out to recognised MCS standards.
Frequently asked questions
How much does air source heat pump installation cost?
In Northamptonshire a full air-to-water air source heat pump installation costs between £8,000 and £14,000 before grants. The £7,500 Boiler Upgrade Scheme grant and 0% VAT bring most homeowners down to between £500 and £6,500. The final figure depends on property size, heat loss, cylinder location and whether any radiators or pipework need upgrading.
How long does the installation take?
The on-site installation usually takes one to three days. From your first survey to a fully commissioned system, expect two to six weeks once you account for the heat loss survey, system design and grant processing.
Will I need new radiators?
Not always. Heat pumps run at lower flow temperatures than gas boilers, so some radiators may need upsizing to deliver the same warmth. Our heat loss survey checks every room and we only recommend changes where they are genuinely needed.
Do you remove my old boiler?
Yes. We safely decommission and remove your existing gas, oil or LPG boiler as part of a full installation, leaving your home tidy and your new system ready to run.
Is planning permission needed?
In most cases no. Air source heat pumps usually fall under permitted development in England, provided the unit meets siting and noise rules. We confirm this during the survey and handle any paperwork if your property is listed or in a conservation area.
Related pages
Ready for a free heat pump quote?
Book a no-obligation site survey. We handle the grant paperwork, system design and installation from start to finish.