Short answer: a heat pump for a typical 3-bedroom house costs £10,000 to £14,000 in the UK (before grants) and $7,500 to $16,000 in the US for a ducted system. Your final price depends on the size of the unit, the condition of your radiators or ductwork, whether you need a hot water cylinder and where you live.
This guide shows exactly where the money goes, so you can read a quote line by line and spot anything that looks too high, too low or missing.
Prices are typical ranges based on market data and installer quotes. They vary by region, installer and property, and grant or rebate rules change, so always compare at least three written quotes.
Average cost at a glance
| United Kingdom | United States | |
|---|---|---|
| Typical system size | 6-8 kW | 2.5-4 tons (30,000-48,000 BTU/h) |
| Typical installed cost | £10,000 – £14,000 | $7,500 – $16,000 |
| Main grant or incentive | Boiler Upgrade Scheme: up to £7,500 (England and Wales) | State, utility and local rebates (the federal 25C credit ended after 2025) |
| Typical cost after help | £2,500 – £6,500 | Varies widely by state and utility |
| Installation time | 2-4 days | 1-3 days |
A 3-bedroom house is usually between 90 and 140 square metres in the UK and 1,400 to 2,200 sq ft in the US. Insulation matters as much as size: a well-insulated 3-bed needs a smaller, cheaper unit than a draughty one.
Full price breakdown: where the money goes
United Kingdom (air source heat pump)
| Item | Typical cost |
|---|---|
| Heat pump unit (6-8 kW) | £3,500 – £6,500 |
| Hot water cylinder (150-250 litres) | £800 – £2,000 |
| Installation labour | £2,000 – £4,000 |
| Pipework, controls and smart thermostat | £500 – £1,500 |
| Radiator upgrades (if needed, per radiator) | £300 – £1,000 |
| Electrical work (if needed) | £200 – £1,500 |
| Heat loss survey and design | £100 – £500 (sometimes included) |
| Commissioning and certification | Usually included |
United States (ducted air source heat pump)
| Item | Typical cost |
|---|---|
| Heat pump outdoor unit and indoor air handler | $4,000 – $9,000 |
| Installation labour | $2,000 – $4,500 |
| Ductwork repairs or modifications (if needed) | $1,500 – $6,000 |
| Electrical work and panel upgrade (if needed) | $500 – $4,000 |
| Permits and inspection | $100 – $800 |
| Thermostat and controls | $150 – $500 |
| Removal and disposal of the old system | $200 – $600 |
Some quotes bundle several of these lines together, but they should all be accounted for. If a quote is much cheaper than others, check which lines are missing.
What changes the price of a 3-bedroom heat pump?
1. Insulation and heat loss
The unit must match your home’s real heat demand, not just its number of bedrooms. A modern, well-insulated 3-bed might need a smaller unit than an older one with solid walls. A room-by-room heat loss calculation (in the UK) or a Manual J load calculation (in the US) is the right way to size the system. Be careful with installers who size by rule of thumb.
2. Radiators or ductwork
In the UK, heat pumps run at lower water temperatures than boilers, so a few radiators may need upgrading. In the US, existing ducts must be properly sized and sealed. Poor ducts are one of the most common hidden costs.
3. Hot water storage
In the UK, if you have a combi boiler, you will probably need space for a hot water cylinder, which adds both cost and installation work. In the US, hot water is usually handled separately, but some homeowners add a heat pump water heater for around $1,800 to $4,500.
4. Type of system
Air source units are the cheapest and most common. Ground source systems for a 3-bedroom house usually cost two to three times more, because of the ground loop, but can run more efficiently. In the US, ductless mini-splits can be a good choice for homes without ducts.
5. Brand and model
Premium brands cost more but often have longer warranties and quieter operation. Mid-range models can offer better value. Check the efficiency rating (SCOP in the UK, SEER2 and HSPF2 in the US).
6. Location and timing
Labour costs vary a lot by region. Large cities and high-cost states are more expensive. Booking outside the busiest season can sometimes cut the price or shorten waiting times.
How much can you save with grants and rebates?
United Kingdom: the Boiler Upgrade Scheme gives eligible homeowners in England and Wales up to £7,500 off an air source heat pump, applied by your installer as a discount on the invoice. You need an MCS-certified installer, and the system must replace a fossil fuel heating system. Scotland has its own scheme through Home Energy Scotland. Check GOV.UK for current conditions.
United States: federal tax credits for heat pumps ended for systems installed after December 31, 2025, but state, utility and local rebates are still widespread. Search for your utility name plus “heat pump rebate” and ask your installer which programs they handle. Some programs offer larger incentives for lower-income households.
What will it cost to run?
A heat pump delivers roughly 2.5 to 4 units of heat for each unit of electricity. For a typical 3-bedroom home:
- Replacing gas: running costs are often similar to a gas boiler or furnace on a standard tariff, and can be lower on a time-of-use or heat pump tariff, or in mild climates.
- Replacing oil, propane or electric resistance heating: savings are usually significant.
- Solar panels: pairing a heat pump with solar can lower bills further.
These figures depend on local energy prices, which change, so compare your current bills with the heat pump’s expected consumption using the installer’s estimate.
Is it worth it for a 3-bedroom house?
It is usually worth it if:
- You are replacing oil, LPG, propane or electric resistance heating.
- You can claim a grant or rebate.
- Your home is reasonably insulated or you plan to improve it.
- You plan to stay in the property for 8 to 10 years or more.
Think carefully if:
- You have very cheap gas and expensive electricity.
- The house is poorly insulated and you cannot upgrade it.
- You have no space for the outdoor unit or a cylinder.
Typical payback: around 8 to 15 years in the UK against a gas boiler with the grant, and often faster against oil or electric heating. In the US, payback is often 5 to 10 years for homes replacing oil, propane or electric resistance, and longer against natural gas.
How to avoid overpaying
- Get at least three written quotes that list every item.
- Check the sizing method. Insist on a proper heat loss or load calculation.
- Ask what is not included. Radiators, ductwork, electrics and permits are the usual surprises.
- Claim every grant or rebate and make sure it is shown on the quote.
- Improve insulation first where it is cheap, because it lets you buy a smaller unit.
- Compare warranty terms and who handles servicing.
- Check credentials: MCS certification in the UK, and a valid state licence and insurance in the US.
Frequently asked questions
How much does a heat pump cost for a 3-bedroom house?
In the UK, most pay £10,000 to £14,000 before grants. In the US, a ducted system typically costs $7,500 to $16,000, depending on state and ductwork.
What size heat pump does a 3-bedroom house need?
Usually 6 to 8 kW in the UK and 2.5 to 4 tons in the US, but the right size depends on insulation and climate. Always insist on a proper heat loss or load calculation.
Can a heat pump heat a 3-bedroom house on its own?
Yes, if it is properly sized and installed. In very cold climates, some US homeowners add a backup heat source or choose a dual-fuel setup.
Do I need to replace my radiators or ducts?
Not always. Many homes need only a few radiators upgraded in the UK, or some duct repairs in the US. A good installer will tell you exactly what is required.
How long does installation take?
Usually 1 to 4 days for the work itself, plus time for the survey, design and booking.
How long does a heat pump last?
With regular servicing, 12 to 20 years is a typical lifespan.
Final verdict
For a 3-bedroom house, expect to pay about £10,000 to £14,000 in the UK and $7,500 to $16,000 in the US, with real differences driven by insulation, radiators or ducts, hot water storage and your local market. Grants and rebates can reduce the final bill significantly, so check what is available before you sign.
The best way to get a fair price is to compare detailed, itemised quotes from several qualified installers and make sure the system is sized around your home’s actual heat loss.