HVAC Sizing vs Window Heat Loss — Home Efficiency

Compare HVAC capacity requirements and window heat loss. Understand how insulation affects your heating and cooling needs.

BTU Calculator

Floor Area (m²)

Ceiling Height (m)

Climate

Window Width (m)

Window Height (m)

U-value (W/m²·K)

Temperature Diff ΔT (°C)

U-value: Single glazing ≈ 5.7 · Double ≈ 2.8 · Triple ≈ 0.8

Area (m²)

1.80

Heat Loss (W)

100.8

Annual Cost (est.)

$65.32

Annual Heating Energy (kWh)

435.5 kWh

Feature	BTU Calculator	Window Heat Loss
Category	practical	practical
Full Page	BTU Calculator	Window Heat Loss