How it works--inside and out.

The heart of the Perfect Window is a heat transfer core that transfers heating or cooling energy from outgoing to incoming airstreams. In the ERV, both heat and moisture are transferred.

Where it works.

Inside your home, a Perfect Window ventilation system can be connected with your heating and cooling system. Or it can be a stand alone system. Your configuration depends on your home and personal needs. For example, you may choose to exhaust stale air from the kitchen, utility rooms, or bathrooms (eliminating the need for noisy ventilation fans) while directing fresh air to bedrooms and living areas. The unit itself is installed in conditioned spaces such as basements, utility rooms or closets.

There are several HRV and ERV models -- most weigh around 70 pounds and measure approximately 31x19x14 inches.

HRV Provides continuous fresh air. Helps reduce window condensation and excess moisture. Uses about the same amount of energy as a 100watt light bulb. Five speeds for specific c demands including frost control.

ERV All features of HRV model, plus: Provides continuous fresh air. Transfers both heat and moisture between incoming and outgoing air streams. Helps reduce amount of humidity brought into home in summer; helps retain humidity in winter.