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heatmark

For heating and air-conditioning installers

Heating and cooling enquiries you don't share.

We post letters under your name to the homes most likely to want new heating or air conditioning, in up to 5 postcode districts you choose. Our own scoring picks them from more than 70 facts we hold on most homes in England. Homeowners contact you directly, and we write for no other installer in your districts while you hold them.

Check your districtSee the packs

The data

What we know about a house before we write to it

We read 20 million energy certificates and four other public datasets, hold more than 70 facts on most homes in England, and score every owner-occupied home on the building alone with our own scoring, once for heating and once for cooling. Below is an example record, scored the same way as every home we write to.

What makes a home high-score? We score every owner-occupied home twice, from the building's own records, never the people in it. The heating score is how likely a home is to want new heating (electric, oil or LPG heating, a poor energy rating, rooms the heating doesn't reach). The cooling score is how likely it is to want air conditioning (a newer airtight build, rooms in the roof, lots of glazing). Both also weigh the size of the job, the space around the house and whether it was on the market recently.

An example record

Detached house, 150 m², oil-fired heating, energy band F

68out of 100Strong fit

Higher than 99 in 100 of the 8.4 million owner-occupied homes we score in England.

We hold more than 70 facts on most homes in England (74 on a typical one), from five public datasets. These six lift this home's score. Each bar shows where it sits.

Is it costly to heat today?

  • Main heating

    Strong

    Oil-fired heating

    Why it matters: Homes off mains gas are about 30 times as likely as gas-heated homes to have a heat pump already. EPC

  • Energy rating

    Strong

    Band F

    Why it matters: Low on the A to G scale. The energy certificate says it costs a lot to run for its size. EPC

Is it a job worth quoting?

  • Floor area

    Strong

    150 m², bigger than 8 in 10 homes

    Why it matters: Big homes have more rooms to keep warm, so the job is worth more. EPC

  • Neighbourhood

    Very strong

    Among England's better-off areas

    Why it matters: Households here are more likely to pay for comfort upgrades. Deprivation index

Is there space around the house?

  • Built form

    Very strong

    Detached house

    Why it matters: Wall space and a garden for outdoor equipment, such as a heat pump or air-conditioning unit, away from the neighbours' windows. EPC

Why now?

  • Put on the market

    Very strong

    In the last two years

    Why it matters: Homes recently on the market often have new owners, and new owners spend the most in their first year or two. EPC

Checked before it scores

  • Owner-occupiedEPC
  • No heat pump yet: oil-fired heatingEPC
  • Not a listed buildingHistoric England
  • Not in a conservation area or other area with tighter planning rulesPlanning data

What we never hold

Names, ages, incomes, phone numbers or emails. We profile the house, not the people in it. Addresses come from Ordnance Survey's licensed address data, are used only to post the letter, and never go to installers.

Where it comes from

  • EPCEnergy Performance Certificate register
  • Deprivation indexEnglish Indices of Deprivation 2019
  • Census 2021Census 2021, how many people work from home
  • Historic EnglandNational Heritage List for England
  • Planning dataplanning.data.gov.uk, conservation areas and other areas with tighter planning rules

Scored by the heating score, the same way as every real home, and compared with 8,351,531 owner-occupied homes in England on 22 October 2026.

Why letters

Lead sites wait for a search. We pick the homes first.

Marketplace enquiries go to several firms at once, and search ads only reach people who are already looking. We start from the house, and write only to the homes whose own records say they're likely to want new heating or air conditioning.

  • Not shared

    One installer per postcode district. Homeowners reply to you, by phone or through a form in your name, and the enquiry goes to nobody else.

  • Picked from the records

    Every owner-occupied home in England, scored on more than 70 facts from public records, such as its size, how it's heated, its energy rating, glazing, rooms in the roof, the space around it and whether it was on the market recently. Your letters go to the homes that score highest, before they start looking.

  • Nothing to run

    No ads to manage, no bidding, no credits. We score the homes and print and post the letters. Homeowners contact you directly.

How it works

Letters under your name. Replies to you.

You give us your brand and choose your districts. We do the rest.

  1. Step 1: We score every home

    Every owner-occupied home in England, from the Energy Performance Certificate register and other public records. Its size and build, how it's heated, its energy rating, extensions, rooms in the roof, glazing and solar. Listed buildings and homes that already have a heat pump are left out. No names and no electoral roll. We profile the house, not the person.

  2. Step 2: You choose up to 5 districts

    One installer per postcode district. While you hold a district, we write for no other installer there.

  3. Step 3: You approve, we post

    You approve your letter once: your logo, your accreditations, your wording. Then we post one-page letters under your name to the best-scoring homes, each written for its house, with your phone number and a QR code. Want to see each batch before it goes? Just say.

  4. Step 4: Replies come to you

    Homeowners call or WhatsApp you from the letter, or scan its QR code and leave their name, number and best time to call, ticking a box to hear from you. We email that to you straight away.

Sample letter

This is what lands on the doormat

This one is for a detached house built since 2000, written in October. The facts about the house come from its energy certificate, never from anything about the people in it.

  • Your letterhead at the top: logo, name, phone and website, where you're based, your accreditations and your reviews. Signed by you at the bottom.
  • A sentence or two about the house from its records, such as its type, its age, how it's heated, an extension or rooms in the roof.
  • A careful line on planning permission, never a promise that none is needed.
  • A QR code, your phone number and a short link. One scan opens a reply page in your name.
  • A small footer saying it's an advertisement from you, sent by heatmark, with a data-source line and an opt-out, as the rules require.

The installer on it, Bramwell Air Comfort (a fictional demo installer), is invented, and so are its logo, accreditations, reviews, address and phone numbers. Everything else is what our system prints.

The whole thing on one page

The sample letter from Bramwell Air Comfort (a fictional demo installer), page one Open the letter full size

Every letter is written for its house

We don't send one letter to a whole district. Each one is written from what we know about that home, so it talks about what the household is most likely to want.

  • Cold or costly to heat

    The letter leads with heating: the rooms that are cold today, and what a heat pump could do for the running costs.

  • Runs hot in summer

    The letter leads with cooling: the room in the roof, the glazed extension, the home office that's too warm by late afternoon.

  • A saving we can show

    Where a home would clearly save on heating, the letter can say roughly how much a year. It's an estimate, printed only when the numbers are clear, and never a promise.

Pricing

Start with one pack. Carry on monthly if it works.

Printing and postage are included in every price.

Your first order

Choose one pack. One payment, nothing renews.

Starter

£375one payment

£1.50 a letter

  • 250 letters
  • 1 postcode district
Choose Starter

Standard

Recommended

£600one payment

£1.20 a letter

  • 500 letters
  • Up to 5 postcode districts
Choose Standard

Season

£1,150one payment

£1.15 a letter

  • 1,000 letters
  • Up to 5 postcode districts
Choose Season

Every pack includes

  • One-page letters under your name, printed and posted
  • You approve the letter before anything is posted
  • Your logo and accreditations on every letter
  • You choose the pace: all at once or in batches
  • Your districts held until 60 days after your last letter
  • Homeowners contact you directly

After your first order

The monthly plan

£149a month, plus £1.20 a letter

£149 a month keeps up to 5 districts yours, plus £1.20 a letter, with as many letters as you want. Cancel any time.

Letters cost £1.20 on the monthly plan, the same as the Standard pack. The £149 is what keeps your districts yours, month after month.

The terms, in plain words

One installer per district
While you hold a district, we write for no other installer there.
Paying is what holds a district
A request doesn't hold anything. We email you a payment link within one working day, and paying holds your districts.
Stop when you like
The monthly plan has no contract: cancel any time. When you stop, your districts are free for another installer to take.
Nothing renews by itself
A pack is for your first order, and it is one payment. After it you carry on monthly, or stop.
You never hold the address list
You get the homeowners who reply, with their name and number. The addresses stay with us.

FAQ

Questions installers ask us

How is this different from Checkatrade or Google ads?

They wait for a homeowner to go looking. We go first: we hold more than 70 facts from public records on a typical home in England, use them to pick the homes in your area most likely to buy, and write to them under your name. The enquiries that come back aren't shared with any other firm.

How do you choose the homes?

With our own scoring. Every owner-occupied home in England gets two scores out of 100, one for heating and one for cooling, from more than 70 facts in public records: its size and build, how it's heated today, its energy rating, glazing, rooms in the roof, the space around it, the neighbourhood, and whether it was on the market recently. Listed buildings and homes that already have a heat pump are left out. Your letters go to the highest scorers in your districts.

How do homeowners reply?

Your letter carries your phone number and a QR code. Homeowners can ring or WhatsApp you directly, or scan the code to open a page in your name and leave their name, number and best time to call, ticking a box to hear from you. We email that to you straight away.

Do I approve every letter?

You approve your letter once, before anything is posted. After that every batch uses it, with each letter written for its house. If you'd rather see each batch before it goes, say so and we'll wait for your OK.

Can I put my logo and accreditations on the letter?

Yes. Your logo, your accreditations, a line on your reviews and where you're based all go on it.

Can I have the addresses?

No. You get the people who replied and agreed to hear from you: their name, phone number and best time to call. The addresses stay with us.

Can I stop?

Yes, any time. A pack is one payment and nothing renews. The monthly plan has no contract, so cancel when you like. When you stop, your districts are free for another installer to take.

Where does the data come from, and is this allowed?

From the national Energy Performance Certificate register and other public property records. We hold no names and use no electoral roll, so every letter goes to “The Homeowner”. The rules on marketing emails and texts don't cover post. We write under “legitimate interests”, the data protection basis for this kind of mailing. We screen every mailing against the Mailing Preference Service, and never write again to anyone who asks us to stop.

Get started

Tell us your districts

Choose your first-order pack, name your postcode districts (one for Starter, up to 5 for Standard or Season) and tell us how to reach you. We'll reply by email within one working day. If one is already held, or doesn't have enough homes on our list, we'll say so and suggest nearby districts that do.

Then we send a payment link for your pack. A request doesn't hold a district; paying does.

Request your districts

No card, no commitment. A person replies within one working day.

Your first order (one payment, nothing renews)

We use these details only to reply about your districts. No card, no commitment.

One installer per district. See if yours is open.

Check a district, or start with one pack: from 250 letters for £375, one payment, nothing renews.

Check your districtRequest a pack