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Air conditioning for homes
A quiet wall unit for the rooms that cook: bedrooms, home offices, conservatories and garden rooms. One room, one unit.
View serviceCooling · Heating · Ventilation
Cool in summer. Warm in winter.
Air conditioning that cools your home in a heatwave and heats it in winter. Send four photos from your phone and get one fixed price in writing, with no visit to quote. Fitting from spring 2027.
At a glance
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Four photos from your phone, no visit to quote
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One fixed amount, in writing
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The man who quotes is the man who fits
What Keystone does
Cool in summer. Warm in winter. Fresh all year.
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Heating from the same unit
Modern air conditioning is a heat pump. The same unit that cools the room in July warms it in January.
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Servicing, cleans and repairs
A yearly service, a deep clean when a unit smells, and repairs for the units I fit, with a yearly care plan.
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Ventilation, condensation and mould
Extractor fans for bathrooms and kitchens, loft units for condensation, and single-room heat-recovery units.
View serviceAbout Keystone
Keystone Air Conditioning
Keystone Air Conditioning is one man, based in Hornchurch and working across Redbridge, East London and Essex. One name runs the job from your first photo to the last screw. No salesman, and no subcontractor you have never met.
A keystone is the stone that locks an arch together. Here your four photos are the other stones: send them from your phone and one fixed amount comes back in writing, worked out before anyone comes round.
Keystone is new. Fitting starts in spring 2027 and the diary is open now, so the first hot week of next summer finds your room already done.
About Keystone Air ConditioningThe quote is what you pay
If your house matches your photos, the amount on your quote is what you pay. If something is different, you are told before any drilling, and you can say no and owe nothing.
You know who is coming
One name on every job, from the first photo to the last screw. No salesman and no stranger at the door.
Your house left clean
Dust sheets down, holes drilled with dust extraction, pipes in neat trunking, everything hoovered and every bit of rubbish taken away.
How it works
Four photos in. One fixed price out.
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Send four photos
The room, the outside wall, the route between them and the fuse board, from your phone.
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Get one fixed price
Worked out from the published list, in writing, with nothing added on the day.
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Pick a date
The diary for spring 2027 is open now. The man who quotes is the man who fits.
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Fitted and tested
Pressure tested, vacuumed and run, with a written test sheet and the house left clean.
Pricing
Prices on the page
One bedroom or home office
from £1,900
- A 2.5 kW unit
- The quiet one for a bedroom, a nursery or a small office
- The unit, new, with its remote and app
- Fitted on an outside wall of the same room, up to 3 metres of pipe
Living room or big bedroom
from £2,400
- A 3.5 kW unit
- Most living rooms and main bedrooms
- The unit, new, with its remote and app
- Fitted on an outside wall of the same room, up to 3 metres of pipe
Open plan or garden room
from £2,800
- A 5 kW unit
- Kitchen-diners, big extensions, garden rooms and conservatories
- The unit, new, with its remote and app
- Fitted on an outside wall of the same room, up to 3 metres of pipe
Areas
Where Keystone works
Based in Hornchurch, working across Redbridge, East London and Essex.
- East London
- Hornchurch
- Redbridge
- Essex
FAQ
Questions
Do you need to visit before you quote?
No. Four photos from your phone are enough for a standard job: the room, the outside wall, the route between them and the fuse board. One fixed amount comes back in writing. If the house turns out different from the photos, you are told before any drilling and can say no.
When can the work be done?
Keystone is new. Fitting starts in spring 2027 and the diary is open now, so you can send your photos today and pick a date before the first hot week. Ventilation work starts in early 2027.
Which areas do you cover?
Keystone is based in Hornchurch and works across Redbridge, East London and Essex.
Can it heat as well as cool?
Yes. Modern air conditioning is a heat pump: the same unit cools the room in a heatwave and warms it in winter.
What does the price include?
The unit, new, with its remote and app. Fitted on an outside wall of the same room, up to 3 metres of pipe. Power connected by a qualified electrician. Pressure test, vacuum and a written test sheet. Dust sheets down and every bit of rubbish taken away. Anything extra is named on your quote before you say yes, never added on the day.
Will a fan cure my damp?
Ventilation moves the damp air out. It is not damp-proofing, and nobody honest promises that a fan alone ends mould.
Your price
Your fixed price, from four photos
Take four photos on your phone: the room, the outside wall where the outdoor unit could go, the route between the two, and the fuse board with its door open. Add them below with your postcode, and one fixed price comes back in writing. No visit to quote.