UK social housing often suffers from "winter-centric" design, where insulation intended for warmth traps heat during summer heatwaves. Thermal justice requires shifts in the building envelope. External shading, such as brise-soleil or shutters, blocks solar gain before it penetrates the glazing. This is far more effective than internal blinds.
Ventilation must be intentional. Designers should prioritize cross-ventilation and the "stack effect," using high-level openings to let warm air escape naturally. High-reflectance "cool roofs" or green roof systems further lower internal temperatures by reducing radiation absorption.
Material choice matters. Using high-thermal-mass materials—like exposed concrete or brick—stabilizes indoor temperatures by absorbing heat during the day. This only works if night-purging allows the structure to cool down before dawn. Adding external greenery provides evaporative cooling, which mitigates the urban heat island effect that plagues dense estates. These steps move the cost of cooling from the tenant's electricity bill to the initial architectural specification.
