Hertfordshire · Heat pump installation
Heat pump installers in North Mymms
Air source heat pumps in North Mymms from an F-Gas certified company, with the manufacturer’s warranty terms explained on your quote. Enquiries answered the same working day.
- Not knowing whether a grant applies
- Working out whether radiators need upsizing
- No space for a hot water cylinder
Air source heat pumps in North Mymms, done properly
Many air source heat pumps can be installed as permitted development in England, without a planning application. Conditions include a maximum outdoor unit size of 1.5 m³, compliance with MCS 020(a), use for more than cooling alone and a site outside the curtilage of a listed building. We check the rules for your property as part of the survey. If you are dealing with deciding on the outdoor unit position and no space for a hot water cylinder, we can help.
Space for an outdoor unit is rarely an issue near North Mymms, so the design comes down to heat loss, radiators and hot water.
Aftercare is simple, and most of it is in the manual: clear space around the outdoor unit, the cleaning the manual describes and a service at the recommended interval. It also keeps you on the right side of any warranty terms that ask for servicing.
- Location
- North Mymms (AL9)
- Wider area
- Hertfordshire
- Typical price
- Air-to-water £8,000–£16,000 before any grant (0% VAT for homes)
- Accreditations
- NICEIC approved, F-Gas certified, MCS
- Replies
- Answered the same working day
- Quotes
- Fixed after a survey or photos
- Telephone
- 07833 053749
- Checked
- 30 October 2026
Air source heat pumps in North Mymms: the local picture
Abdale Cottage, listed at grade II, is one of roughly 7 protected buildings and structures in the half-mile around North Mymms’s centre. Where a home is affected, the outdoor unit position is settled with Welwyn Hatfield council, normally the planning authority here before the heat pump design is finished. VOA council tax data date about 41% of homes across North Mymms and its surrounding area to the post-war years, 1945 to 1972. Whether the walls and loft have been insulated makes a real difference to the heat pump size for homes of that period.
If your home is near Brookmans Park station and heated by a gas boiler, an air-to-water heat pump can replace it where the survey shows it suits. If your home is one of the older properties near Church of St Mary the Virgin, the survey checks whether it’s listed or in a conservation area before the outdoor unit position is chosen.
North Mymms is about 2 miles north-west of Potters Bar, in Hertfordshire. Wherever you are in the AL9 postcode area, we can help with air source heat pumps. Our Hertfordshire coverage runs to 381 places, North Mymms among them. There’s also a page for London, about 16 miles away.
You’ll find streets such as St Mary's Church Road, Abdale Lane and Warrengate Road, each of them within reach. If your postcode is in AL9, the property is within reach. Close to North Mymms, our area also takes in Welham Green (1 mile north), Colney Heath (2 miles north-west), Sleapshyde (3 miles north-west), Hatfield (3 miles north) and Shenleybury (3 miles west). Larger places within reach include Watford (9 miles south-west), Hemel Hempstead (11 miles west), Stevenage (13 miles north) and St Albans (5 miles north-west).
What’s near North Mymms
We fit and service air conditioning in homes and premises around Chancellor's School, North Mimms Park and The Old Maypole Public House, among other places. The nearest railway station is Brookmans Park station, roughly 0.7 miles east of the centre. Well-known places in the area include Shenley Hospital (3.5 miles south-west) and Potters Bar Museum (2 miles south-east). The countryside around North Mymms includes Furzefield Wood and Lower Halfpenny.
Also near North Mymms
More services for North Mymms
Common questions in North Mymms
Will you come out to North Mymms?
Yes, smaller places are covered as well as towns. A few photos and the postcode are enough to get things started.
Is the heat pump grant available in North Mymms?
Yes, the scheme covers homes in England, including North Mymms, if they qualify. The amount depends on the type of heat pump, and the survey confirms which applies. The installer applies, and we are MCS certified.
What warranty do I get?
It’s the manufacturer’s, and the terms are theirs. Some brands make regular servicing a condition so it’s worth keeping the service records.
Should I choose air-to-water or air-to-air?
The right choice depends on the property and what you need. The grant is £7,500 for eligible air-to-water systems and £2,500 for air-to-air in limited cases, and we set out the options after the survey.
Is a heat pump permitted development?
In England, many air source heat pumps on houses can be permitted development provided the conditions are met. These include an outdoor unit of no more than 1.5 m³, compliance with MCS 020(a), not being used solely for cooling and not being within the curtilage of a listed building.
Do you survey before quoting?
Yes, every time. Diagnosis comes before treatment: the survey shows what’s needed, where things go and what access we need, and the quote is based on that.
Will my radiators work with a heat pump?
It depends on each radiator and the room it heats. At the lower temperatures a heat pump uses, radiators need more surface, and the survey checks each one.
For landlords and property managers
Facilities teams in offices, schools and public buildings book us too across Hertfordshire. Work can be phased by floor, zone or building to keep disruption down.
Under the GB F-gas rules, responsibility for leak checks is shared between whoever operates the equipment and the engineers who work on it. Where a building is let or managed, the lease or contract should make clear who looks after the system, and we can work for either side.
How it works
Refrigerant work is done by qualified engineers working for an F-Gas certified company, and electrical work is done by us as NICEIC approved contractors. On the day, both are in the same hands. The work takes from a couple of days to around a week, depending on the system and how much of the heating changes. Photos of the room and the outside of the property help us plan a visit to North Mymms.
- It begins with your house and the heating it relies on now.
- We measure heat loss for every room.
- The design covers the heat pump, emitters, hot water and outdoor unit.
- Cost, grant and VAT appear on one fixed-price quote.
- We install, commission and register the system under MCS.
Before we arrive
- Clear the space around the indoor unit, or where it will go
- Keep pets and children away from the work area
- Find the manual or the paperwork for the system, if you have it
Get a fixed-price quote
Need a price for air source heat pumps? Please ring 07833 053749 or write to us at info@aircondoctor.co.uk and tell us about the job. We’ll talk you through the options and give you a fixed-price quote before you commit to anything.
Read more
What owners can safely do
Owner care supports servicing; it doesn’t replace it. Clean filters and a clear outdoor unit help the system run as it should, but the inside of the units, the refrigerant and the electrics still need a qualified engineer.
For air conditioning, cleaning the indoor unit’s filters is the main job owners can do where the manufacturer’s manual explains how. They come out, get a gentle clean and go back only when they’re dry. On a heat pump, the equivalent is keeping the outdoor unit clear and checking the controls.
System by system
Radiators and underfloor heating
Heat pumps run at lower flow temperatures, so radiators may need to be larger so we check them against each room’s heat loss.
Air-to-water heat pumps
An air-to-water heat pump heats water for your radiators or underfloor heating and your hot water cylinder. It replaces the boiler as the main heat source and we install it to MCS standards.
A customer’s words
“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