Hertfordshire · Heat pump installation
Air Source Heat Pumps in Harmer Green
Air source heat pumps in and around Harmer Green, from a site survey or diagnosis to sign-off and a fixed price agreed before any work starts.
- Wanting to stop using oil, LPG or gas for heating
- Checking whether planning permission is needed
- Radiators that may be too small for a heat pump
Air source heat pumps in Harmer Green
For an air-to-water heat pump, the price is £8,000–£16,000 (0% VAT on homes), before the grant. In England and Wales, the Boiler Upgrade Scheme offers a £7,500 grant towards an eligible air-to-water installation and the installer makes the application. Not every home qualifies, so we check eligibility before you commit. Typical jobs include not knowing whether a grant applies and wanting to stop using oil, LPG or gas for heating, across air-to-water heat pumps, radiator systems and hot water cylinders.
Space for an outdoor unit is rarely an issue near Harmer Green, so the design focuses on heat loss and radiators.
Looking after a system is mostly common sense: clear space around the outdoor unit, the cleaning the manual describes and a service at the recommended interval. That also helps where the warranty terms ask for regular servicing.
- Location
- Harmer Green (AL6)
- Wider area
- Hertfordshire
- Pricing
- Fixed, in writing
- Credentials
- NICEIC approved, F-Gas certified, MCS
- Guide price
- £8,000–£16,000 (0% VAT on homes), before the grant
- Response
- Answered the same working day
- Telephone
- 07833 053749
- Reviewed
- 30 October 2026
Owner checks or an engineer?
For air conditioning, cleaning the indoor unit’s filters is the main job owners can do, if the manual says so. They come out, get a gentle clean and go back only when they’re dry. For a heat pump, the main owner jobs are a clear outdoor unit and sensible control settings.
Before you call us about a fault, a few checks can save a visit: is the system in the right mode, is the set temperature sensible, are the remote’s batteries working and has the breaker tripped. If a breaker trips again after you reset it, leave it off and call 07833 053749.
What happens if it’s left?
If the emitters cannot give out enough heat, some rooms will not get warm enough. Checking and upsizing them as part of the installation avoids that. An early booking makes the visit to Harmer Green easier to arrange.
No two properties are the same, so we price each one individually. The equipment, how we reach it, the route between units and the work needed all play a part.
Why people in Harmer Green choose us
- One number for homes and businesses across London and the South East
- F-Gas certified company
- 24/7 emergency line for breakdowns
- MCS certification for heat pump work
Take a look at our cost guide or our accreditations and certificates.
What the work involves, system by system
Air-to-air heat pumps
Air-to-air heat pumps warm rooms through indoor units and can cool them in summer. They don’t heat hot water, so that has to come from elsewhere.
VAT on heat pumps
Please treat this as general guidance rather than tax advice.
Air source heat pumps in Harmer Green: the local picture
Census 2021 figures found about 82% of households in detached or semi-detached houses. Finding room for the outdoor unit and a cylinder is seldom a problem in homes like these.
Homeowners near Welwyn North station often ask whether a heat pump can take over from the boiler, and the heat loss survey answers that. With Digswell House about 1.5 miles south-west, it’s worth asking whether your own home is listed before planning a heat pump.
Harmer Green is about 2 miles north of Welwyn Garden City, in Hertfordshire. If you need air source heat pumps in Harmer Green, please ring us on 07833 053749 or write to us at info@aircondoctor.co.uk for a fixed-price quote. Our area covers London and the South East, Harmer Green included. Count every place we list in Hertfordshire and you reach 381, with Harmer Green on the list. London, roughly 23 miles off, has its own page on this site.
Jobs in AL6 are looked at, quoted and booked the same way as anywhere else. Nearby, we also cover air source heat pumps in Burnham Green (1 mile east), Tewin Wood (1 mile east), Oaklands (1 mile north-west), Bull's Green (1 mile north-east) and Digswell (1 mile south-west). Within a short drive, we also cover Watford (15 miles south-west), Hemel Hempstead (13 miles south-west), Stevenage (5 miles north) and St Albans (8 miles south-west).
What’s near Harmer Green
Around Harmer Green, our work takes us to homes and businesses near Danesbury Park, Monk's Walk School and The White Horse Public House. The nearest railway station is Welwyn North station, about 0.8 miles south-west of the centre. Other landmarks nearby include Hertford Castle (4.9 miles south-east) and Queen Elizabeth II Hospital (3.4 miles south). Open spaces near Harmer Green include Tewin Orchard and Hopkyns Wood.
Questions from Harmer Green
Will a heat pump in Harmer Green need planning permission?
That depends on the building and where the outdoor unit goes. Around 6 listed entries sit within 0.5 miles of central Harmer Green. A heat pump on a house can be permitted development if it meets the conditions, including the MCS noise check, but not within the grounds of a listed building, and in a conservation area the outdoor unit can’t face a road. Where needed, we check with the local planning authority (for Harmer Green, usually East Hertfordshire council).
Can I get the Boiler Upgrade Scheme grant in Harmer Green?
Yes, the scheme covers homes in England, including Harmer Green, if they qualify. The grant is £7,500 for an air source (air-to-water) heat pump and £2,500 for an air-to-air system that replaces the existing fossil-fuel heating. As an MCS certified installer, we apply for it on your behalf.
Do you work on commercial properties?
Yes. From one rented home to commercial buildings, we work the same way: a look first, a fixed-price quote and written records.
How soon will you get back to me?
You’ll hear from us the same working day. For a breakdown that can’t wait, call our 24/7 emergency line.
Do you protect the property while you work?
Floors and furniture near the work are covered with dust sheets before we start, and the area is kept tidy throughout. At the end, we clear up and show you what we’ve done.
Which manufacturers do you install and repair?
Mitsubishi Electric, Daikin, Fujitsu, Panasonic, Toshiba, LG, Samsung, Mitsubishi Heavy Industries, Hitachi and others. For new systems, we recommend a brand and model to suit the job and explain why.
Are my radiators big enough for a heat pump?
That depends on the room’s heat loss and the radiator’s size. We check them all during the survey and the quote shows what’s needed.
How the visit works
Protection comes first: dust sheets over floors and furniture near the work and nothing is moved without asking you. Then the electrics are made safe and the work begins. The work on site takes a few days for most air-to-water installations, with air-to-air systems often quicker, and we clear up before we go. Photos of the existing unit help with repairs and servicing in Harmer Green.
- You tell us about the home and what you want from a heat pump.
- We survey for heat loss and look at radiators, cylinder space and outdoor unit options.
- We recommend air-to-water or air-to-air and check the grant position.
- We install the heat pump and connect it up.
- We commission it, complete the MCS certificate and show you how to use it.
Before we arrive
- Name a contact who can meet us at the agreed time
- Clear a path to the units and the space around them
- Make sure we can reach the outdoor unit, or where it will go
Getting a quote
Published ranges are a starting point; the quote is built on your property, because every property is different. Once we have looked at the job, from photos or on a survey, you get a fixed price. To start, ring us on 07833 053749.
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Also near Harmer Green
What else we do in Harmer Green
What a customer said
“Very professional from the initial survey through to installation. The engineer explained everything clearly and the quote was exactly what we paid. Would not hesitate to recommend AirCon Doctor.”
David W., Haywards Heath