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Education Resources   >   Thermal Performance
Quick Fact

Do you remember the old saying, "An ounce of prevention is worth a pound of cure?"  It is never more relevant than when dealing with thermal performance in your home.

Thermal Performance / Building Envelope

Since the bulk of your utility costs are spent on heating and air conditioning, it is important to understand the concept of heat transfer and how it affects the temperature of air inside your home. Heat naturally flows from warmer areas to cooler areas. An energy efficient home will keep the majority of the heat out in the summer and inside during the winter. This concept is often referred to as thermal performance. Making your home operate like a thermos bottle will substantially reduce the operating time of your furnace and air conditioner providing greater energy savings while increasing comfort.

Heat transfer in and out of the building envelope occurs in one of three ways:

Conduction (50%)
Heat transfer through materials such as attic, walls, and floors.

Radiation (25%)
Heat transfer through windows, sliding glass doors, and skylights.

Convection (25%) 
Heat transfer through openings such as cracks, leaks, and gaps.

(These percentages can vary depending upon building design and other factors.)

Controlling heat gain in the summer and heat loss in the winter should always be a top priority when adopting a “whole house as a system” strategy.

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