Written for Chilterns houses. We would rather you understood the decisions than took our word for them.
What each looks like, every finish, the sizes, and which suits which room.
PlanningThe rules changed on 29 May 2025 and most guidance online still has it wrong. What applies now, and what conservation areas and listed buildings mean for your project.
Choosing an installerF-Gas registration, Part P certificates, fixed prices, noise calculations and warranty conditions. Useful whoever you end up using.
NoiseThe limit became 37 dB on 29 May 2025 — and most installations now pass more comfortably than before. Why, and what actually reduces noise.
InstallationHow the unit on your wall connects to the one outside, what decides the route, and when one outdoor unit makes more sense than two. With drawings.
Already have one?Type the model number from the label: the make, the type, its size, which gas it runs on and roughly how old it is, and whether it can be serviced.
HeatingThe garden office, loft or extension your radiators never reach: air conditioning heats it in winter and cools it in summer.
We would rather publish a few things worth reading than thirty that are not. Guides appear here as we have something genuine to say.
The survey is free, takes 45 minutes, and answers these questions for your own rooms.
Book a free survey