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A calm, cool bedroom with the curtains drawn
Keystone Air Conditioning

Air conditioning for homes

A quiet wall unit for the rooms that cook: bedrooms, home offices, conservatories and garden rooms. One room, one unit.

What to send first

  • Which room, and roughly how big it is
  • Whether you want it mainly for cooling, heating or both

Top floors, south-facing rooms and anything with a glass roof hold the heat long after the sun goes. A wall unit fixes those rooms. Picture a bedroom cool and quiet enough to sleep in, or a home office you can work in through a heatwave with the window shut.

Each room gets one indoor unit and one small outdoor unit on the wall outside, joined by two thin copper pipes. Start with the worst room. Not sure which size? The photos show it, and the unit is sized to the room, not to the biggest one there is to sell.

Send four photos from your phone: the room, the outside wall, the route between them and the fuse board. One fixed amount comes back in writing, with no visit to quote. Fitting starts in spring 2027.

Values

The 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.

Frequently Asked 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.

Contact

Details that help

  • Which room, and roughly how big it is
  • Whether you want it mainly for cooling, heating or both

Add up to 5 photos of the job.