Why Windsor homes struggle in summer
The Thames Valley is one of the hottest parts of the country, and Windsor sits right in it — low-lying, sheltered and increasingly built up. When a hot spell arrives, it tends to arrive here first and hang around.
The housing stock makes it worse. The Georgian townhouses of the town centre, in the streets around the castle, hold heat in thick masonry for days after the weather breaks. Windsor's Victorian terraces were built to keep coal-fire warmth in, not summer heat out, and their upstairs bedrooms are usually the first rooms to become unusable in a heatwave. Later semis and riverside flats tend to stay bearable downstairs and cook above.
A modern split system is the usual answer, and it does more than cool: it is a reversible air-to-air heat pump, so it heats in winter too, more efficiently than plug-in electric heating. We are deliberately not printing prices on this page — the cost depends heavily on the individual property, and made-up ranges help nobody. Our cost guide explains what actually drives the price. One thing worth knowing up front: the Boiler Upgrade Scheme covers air-to-water heat pumps only, so air-to-air systems are not eligible for that grant.
Conservation areas, listed buildings and old wiring
A lot of central Windsor sits within conservation areas, and many buildings near the castle are listed. That does not rule out air conditioning, but the placement of any outdoor unit needs checking with the Royal Borough of Windsor and Maidenhead before anything is fixed to a wall, and listed buildings need consent. Do not let anyone tell you it will be fine without checking. Flats and leasehold properties usually need the freeholder's permission as well.
Then there is the wiring. Many of Windsor's older homes run on electrics installed long before anyone imagined air conditioning. An electrical condition report from a qualified electrician will tell you where you stand, and some older properties need a consumer unit upgrade before an installer will connect a system. Our guide to whether your home's electrics can handle air conditioning explains what to look for.
Where Coolhouse has got to in Windsor
Here is the honest position: the installers we have vetted so far work in St Albans and Harpenden. We do not yet have an installer we can vouch for in SL4, and we would rather say that plainly than promise a fast quote we cannot stand behind.
We are building our Windsor network now. If you are weighing up air conditioning — even loosely — register your interest and we will tell you exactly where we have got to. When there is a Windsor installer we are happy to put our name to, you will be the first to know.