The SolarVenti HR20 is an air collector heat recovery system that both utilises the heat from the sun and recovers the heat from the house. As a third plus, you get the air effectively cleaned down to pollen level - without expensive filter changes. That way you save a lot of money on your heating bill - year round. The heat recovery is 83% - and when you add the free solar heat, you get well over 100 %. So this system contributes to the heating, while the air is always fresh and cleaned.
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