Building Heat Loss (Or Gain)

Heat loss (or gain) in a building is a result of:

1. Transmission through walls, floor, and the ceiling.
2. Infiltration through cracks, windows, and around doors caused by wind and the chimney effect from heat stratification.
3. Exfiltration from exhaust fans and flues from fossil boilers, ovens and furnaces.

The following table lists the three causes together with the methods for reducing each:

Reduction of Heat Loss

Transmission	Insulation
	Storm windows
	Heat fan to minimize stratification
	Radiant heaters to warm personnel while lowering overall temperature
Infiltration	Caulking
	Repair windows
	Automatic closers on doors
	Heat fan to reduce stratification
	Radiant heaters
Exfiltration	Use of electric ovens, furnaces and boilers to eliminate exhaust flues
	Heat wheels, heat pipes and run around systems for recovering heat from exhaust system