Energy Efficiency
The Year-Round Window: Specifying Glazing for Warmer UK Summers and Colder Winters
UK window advice has long been framed around U-values and winter heat loss. But a well-insulated home can also trap summer solar heat, so a 2026 glazing specification needs to balance winter solar gain with summer comfort. This guide explains g-values, solar-control glass, shading and ventilation in plain English.