Our homes are becoming thermally efficient. What some began to wonder, though, was whether they are still habitable. We´ve installed tight windows and doors, modern siding , insulation and caulk for every crack through which air might pass. And life inside our tight home generates moisture and pollutants, they circulate freely throughout our houses, possibly causing a range of symptoms and allergic reactions.
Heat recovery ventilation systems maintain high indoor air quality without excessive additional energy costs. It consists of two separate air-handling systems – one collects and exhausts stale indoor air while the other draws in outdoor air and distributes it throughout the house. Also, the heat recovery systems are equipped with filters that keep particulates such as pollen or dust from entering the house.
It is important to say, that only the heat is transferred and the two air streams are physically separate. Depending on the model, the heat recovery ventilation can recover up to 85 percent of the heat. This reduces the energy needed to heat outdoor air to a comfortable temperature.
Typically, the heat recovery system can change all the air in the house over a three-hour period.