Written from our own surveys and installations in the Chilterns. We would rather you understood the decisions than took our word for them.
The 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 tightened to 37 dB in May 2026 — and most installations now pass more comfortably than before. Why, and what actually reduces noise.
Real figures from systems we have installed, not manufacturer estimates. Published once we have a full season of data.
We would rather publish three things worth reading than thirty that are not. Guides appear here as we have something genuine to say.