Hertfordshire · Heat pump installation
Air Source Heat Pumps in The Folly
Air source heat pumps for The Folly, from F-Gas certified engineers, with warranty terms explained brand by brand. We reply to enquiries the same working day.
- Deciding on the outdoor unit position
- Checking whether planning permission is needed
- Working out whether radiators need upsizing
The process
The visit has three parts, a bit like a doctor’s appointment: diagnose, treat and sign off. First we check the system or the space against the plan, then the work itself, and finally we test, record and explain. Most of the time goes on the middle part, which 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 The Folly.
- It begins with your house and the heating it relies on now.
- We measure heat loss for every room.
- From those figures we size the heat pump and decide on radiators, cylinder and outdoor position.
- You get a fixed price, with any grant and the VAT set out.
- Then it’s fitted, commissioned and registered with MCS.
Getting ready for the visit
- Let us know where the consumer unit is
- Give us access to the outside wall, roof or yard where the outdoor unit sits
- Plan for pets to be kept clear during the visit
Get a fixed-price quote
Getting a quote is straightforward. Send a few details and pictures, and we reply the same working day. If we need to see the property first, we book a survey at a time that works for you.
Advice
Air source heat pumps in The Folly
A heat pump takes heat from the outside air and moves it into your home with electricity running the compressor and fans. It works on the same principle as air conditioning, run the other way and the Energy Saving Trust notes that air-to-air heat pumps are sometimes referred to as air conditioning. Typical jobs include ageing boilers that will need replacing and moving away from fossil-fuel heating, across underfloor heating, air-to-air heat pumps and hot water cylinders.
Older and listed homes in villages like The Folly need extra care, because permitted development does not apply within the grounds of a listed building, so consent comes first.
Any work on the refrigerant circuit is recorded: what was done, the refrigerant type and any amount added or recovered. Keep the records with the manual and the warranty documents, as a manufacturer or a future engineer may ask to see them.
- Location
- The Folly (AL4)
- Region
- Hertfordshire
- Credentials
- F-Gas certified, NICEIC approved, MCS
- Prices
- Air-to-water £8,000–£16,000 before any grant (0% VAT for homes)
- Replies
- On the working day you ask
- Quote
- Fixed, in writing
- Telephone
- 07833 053749
- Checked
- 30 October 2026
Places near The Folly
What else we do in The Folly
Common problems we fix in The Folly
When a home is being extended or renovated, it’s a good moment to look at heat pumps. It’s simpler to plan radiators, pipework and a cylinder while the builders are in.
Customers usually contact us after spotting one of these:
- No space for a hot water cylinder
- Plans to switch to electric heating with a heat pump
- Checking emitters for a heat pump
With Shaw's Corner about 2 miles north-east, it’s worth asking whether your own home is listed before planning a heat pump.
Questions to ask before booking
- Whether they looked at the job before pricing it
- Whether a new circuit is included and who certifies it
- Whether extra work needs your approval first
Air source heat pumps around The Folly
The 2021 Census found about 69% of households in detached or semi-detached houses. Detached and semi-detached houses typically have room for the outdoor unit and a cylinder. There are 4 conservation areas within a mile of the centre of The Folly. About 3 listed entries lie within half a mile of central The Folly, Lea House (grade II) among them. So the heat pump survey asks two extra questions here: is the home listed, and is it inside a conservation area?
Live in one of the older houses around St Helen's Church? Expect the survey to look closely at heat loss and at the building’s planning status.
The Folly is about 2 miles east of Harpenden, in Hertfordshire. For air source heat pumps in and around The Folly, please phone 07833 053749 for a fixed-price quote. Our area covers London and the South East, The Folly included. Count every place we list in Hertfordshire and you reach 381, with The Folly on the list. You can also see our page for London, about 24 miles away.
Here we cover the AL4 postcode area. That includes properties on Folly Fields and Lower Luton Road and nearby roads. Places around The Folly that are also on our list: Lea Valley (1 mile west), Amwell (1 mile south), Mackerye End (1 mile north-west), Blackmore End (1 mile north) and Batford (1 mile west). Within a short drive, we also cover Watford (11 miles south), Hemel Hempstead (8 miles south-west), Stevenage (8 miles north-east) and St Albans (5 miles south).
Near you in The Folly
Around The Folly, our work takes us to homes and businesses near Sir John Lawes School and The Cherry Trees pub, among other places. The Folly’s nearest station is Harpenden station, roughly 2 miles west. Nearby you’ll also find St Albans City Hospital (4.2 miles south) and Harpenden Museum (2.2 miles west). Green spaces nearby include Wheathampstead Local Nature Reserve.
System by system
Air-to-air heat pumps
A £2,500 Boiler Upgrade Scheme grant is available for air-to-air only if it replaces the fossil-fuel heating and meets the full heating demand. It must be installed by an MCS certified installer and be in a home.
Hot water cylinders
Hot water from an air-to-water system is stored in a cylinder. The survey looks at where it can go, especially if you have a combi boiler.
What air source heat pumps cannot fix
Before you book, it helps to know what’s not included:
- Any gas work on the existing boiler
- Getting planning permission or listed building consent on your behalf
- Improving the building’s insulation
If you are not sure, just ring 07833 053749 or write to us at info@aircondoctor.co.uk and we’ll give you a straight answer.
Where we work
- Hot water cylinders
- Air-to-air heat pumps
- Air-to-water heat pumps
- Radiator systems
- Homes heated by oil, LPG or gas
- Underfloor heating
FAQs for The Folly
Is The Folly within the area you cover?
We do. Villages and hamlets get the same service as the bigger towns. Send a few details and pictures, and we reply the same working day.
Can I get the Boiler Upgrade Scheme grant in The Folly?
The Folly is covered, as the scheme runs across England and Wales. It gives £7,500 towards an air-to-water or ground source heat pump, or £2,500 towards an air-to-air heat pump that replaces the fossil-fuel heating and meets the whole home’s heating need. As an MCS certified installer, we apply for it on your behalf.
Does servicing affect my warranty?
It can, for some brands. Read the manufacturer’s terms, or send us the make and model and we will explain them, and book the service at the interval they recommend.
How much does an air source heat pump cost?
For air-to-water, the price is £8,000–£16,000 (0% VAT on homes) before any grant. The Boiler Upgrade Scheme offers £7,500 to eligible homes in England and Wales, and we confirm eligibility before you commit.
Is there a survey before the work?
Yes. Photos often do the job for simple work, while bigger systems and repairs that need testing get a visit.
Can we book visits on a schedule?
Yes. Send details of the systems and how they’re used, and we will suggest a schedule with a fixed price. That can include the leak checks the F-gas rules require for larger systems.
Can I do the refrigerant work myself?
The refrigerant side has to be done by a qualified engineer working for an F-Gas certified company. That’s a legal requirement, and manufacturers expect it for their warranty too. We can quote for the whole job, from supply to commissioning.
A customer’s words
“Office air con broke down in the July heatwave. Called at 8am, engineer was here by noon and fixed within 2 hours. Brilliant emergency response. They now hold the service contract for the whole building.”
James T., Crawley, office manager