Why garden city houses get warm
The original housing west of the railway — around Handside Lane, Guessens Road and the streets off Parkway — was built in the 1920s and 30s with generous windows and big gardens. Mature trees and deep plots keep downstairs reasonably pleasant, but upstairs is a different story: bedrooms under plain tiled roofs soak up heat all afternoon and let it go slowly through the evening. Loft conversions, common in these houses, are usually the hottest room of all.
East of the railway the mix is broader — interwar workers' housing around Peartree, post-war and later estates out at Panshanger and Haldens — and much of it is lighter in construction, so it heats up faster in the first place. Different problem, same sticky nights.
A modern split-system unit deals with both, and it is worth knowing what you are actually buying: a reversible air-to-air heat pump, which cools in summer and can heat the same rooms in winter for far less electricity than a plug-in heater. It does not qualify for the Boiler Upgrade Scheme, which covers air-to-water systems only. We are not going to print prices here, because they depend on the house, the rooms and the installer — our cost guide sets out realistic ranges and what pushes a job up or down.
The estate management scheme, and your electrics
Welwyn Garden City is unusual: much of the original town is covered by an estate management scheme that controls alterations to the outside of houses, and an outdoor condenser unit is exactly that kind of alteration. Check with the borough council before anything goes on a wall — a screened position at the side or rear is normally the sensible starting point. The same goes for any conservation area street: check first, never assume. Flats will also need the freeholder's consent.
Electrics matter too. A 1930s house may have been rewired several times over, and older consumer units sometimes need upgrading before an installer will connect a unit. A qualified electrician can settle the question with a standard inspection — our guide on whether your home electrics can handle air conditioning explains what they look for.
Where Coolhouse is up to here
Straight answer: our vetted installers currently work in St Albans and Harpenden, a few miles west. We have not yet vetted anyone based in Welwyn Garden City, so we will not promise you a fast local quote — we are building our installer network here now. If you leave your details, we will tell you honestly where we have got to, and get in touch the moment we have someone covering AL7 and AL8 that we would happily send to our own homes.