With today's tight building envelopes, good indoor air quality can be a real challenge, especially when the solution to stagnant air seems as simple as opening a window for a gentle breeze. Though it's the symbol of health and comfort, you soon realize that in addition to heat, cold and humidity, which quickly detract from a building's energy efficiency, an open window is also allowing dirt and allergens into the living environment.

With a ground-air heat exchange system, you can have fresh air indoors without these drawbacks.