The diagrams illustrate design strategies used in house construction to maintain comfortable indoor temperatures in cool and warm climates respectively.Overall, while cool-climate design centres on capturing and storing heat using angled roofs and thermal mass, warm-climate design relies on reflection and shading by day and ventilation by night to keep the interior cool. Both approaches use insulation, though for opposite purposes: to retain heat in cool regions and to block it out in warm ones.
In cool climates, houses are designed to maximise heat retention. A high-angled roof allows sunlight to enter at a steep angle and reach deep into the building, where a thermal building material, typically positioned opposite the window, absorbs and stores this heat throughout the day. Insulation is fitted around the exterior walls to minimise heat loss, while a strategically placed window captures direct sunlight, ensuring warmth is trapped and released gradually as temperatures drop.
By contrast, warm-climate houses are designed around a day-night cycle to prevent heat build-up. During the day, external insulation and a reflective roof deflect solar radiation, while roof overhangs shade the windows, which are kept closed and covered to block heat entry entirely. At night, the strategy reverses: windows are opened to allow ventilation, letting a flow of air remove any heat that has accumulated in the building over the course of the day.