In the UK, U-values and R-values describe heat performance but from opposite angles. A U-value (W/m²K) measures how much heat passes through a building element; lower is better and it is central to Building Regulations. An R-value (m²K/W) measures how strongly a material resists heat flow; higher is better and it is common on insulation […]
A good U-value for UK homes is one that beats Building Regulations minimums while staying realistic for the project and budget. Typically, this means about 0.15–0.18 W/m²K for walls, 0.10–0.16 for roofs, 0.10–0.18 for floors, and 0.8–1.4 for modern windows and doors. These levels cut heat loss, reduce heating demand, and improve comfort with warmer […]
A room-by-room heat loss calculation is a systematic way to work out how much heat each individual room in a UK home loses in winter. It uses room dimensions, construction details, window and door types, and location to set indoor/outdoor design temperatures. Heat loss through walls, floors, ceilings, and openings is calculated, along with ventilation […]
Correctly sizing a heat pump in the UK starts with an accurate heat loss calculation for heat pump sizing, carried out room by room and based on insulation levels, airtightness and local winter design temperatures. It must consider U‑values for walls, roofs, floors, windows and doors, plus ventilation and infiltration losses. Unlike boilers, heat pumps […]
How is heat loss calculated in a house? A heat loss calculation for a UK house assesses how much heat escapes through walls, roof, floors, windows, doors and ventilation under standard winter conditions. It uses room dimensions, construction type, insulation levels, glazing performance, air‑tightness, and typical UK indoor and outdoor design temperatures. Fabric losses and […]
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