Why energy efficient windows and doors are important
Compared to other building materials, ordinary windows and doors are poor heat insulators. They are the pat of least resistance for heat flow, hence they allow a disproportionate amount of heat loss and gain compared to other building materials.
A typical, well insulated house with ordinary windows and doors can lose up to 49% of its interior heat in winter and allow up to 78% of solar heat gain in summer.
Energy efficient windows and doors act as extra insulation
Energy efficient windows and doors are designed to provide higher levels of resistance to heat transfer – acting as extra thermal insulation through high performance frames, seals and glass.
They help insulate from temperature extremes, smoothing out the peaks and troughs throughout the year – helping homes stay cooler in summer and warmer in winter.