Abstract
Overall heat loss from the building is a sum of the losses of heat through windows, doors, walls, roof, floors, basements, ventilation systems and infiltration. This chapter specifically discusses heat loss through windows and sustainability techniques that help improve bottom line.
Keywords: Window, window insulation, window replacement, U-value, R-value, payback period, heat transfer, heat loss, cost of heating, cost of cooling, old window, draft, draft cost, draft cost calculation, heat loss, heat loss across window, type of window, window frame, argon gas effect, when to replace window.