Heat transfer
Where the heat goes: U-values, the warm air under the roof, and condensation on cold surfaces.
- U-values and heat lossHow much heat leaves a hall through its roof, walls, windows and floor over a heating season, and why the roof usually loses the most.
- Warm air under the roofWarm air rises and collects under the roof, where it costs the most. See how much of the heat bill stratification accounts for, and what mixing the air saves.