Highly efficient and worry-free, Venmar's AVS Duo provides clean healthy air while reducing your energy costs during the heating and cooling seasons. The AVS Duo System evacuates stale contaminated indoor air, regulates humidity level and supplies a continuous flow of fresh, clean outdoor air. During the exchange, both heat and moisture are transferred from one air stream to the other. This translates into minimal ventilation costs and a dramatic imporvement in your indoor air quality. Install a Venmar AVS Duo and you'll notice the difference right away. and that goes for both the heating and the cooling season.