British homes were built to hold heat in

Solid brick, small windows, dark roofs, loft conversions, and a decade of insulation retrofits optimised entirely for winter. Building Regulations Part O sets an overheating standard for new builds. It says nothing about the twenty eight million homes that already exist.

This site is about those homes: what actually reduces the temperature in a British bedroom, what it costs to run, and when the honest answer is that no machine will fix it.