In a cold climate zone, it meant that cold, dry winter air would need to be warmed as well as humidified having found it's way into a house - otherwise known as drafts, while hot and humid air would enter in the summer whether you wanted it or not. These houses were said to 'breathe', but that would be like breathing through your skin instead of through your nose. Up until the last few decades, houses were so leaky to air infiltration that sufficient cold dry air seeped in to meet the needs of occupants, and ensure homes had no moisture damage. In an effort to clear that up, we will first explore why ventilation is so crucial, then explain the options and their best applications. Energy recovery from exhaust air is becoming common place in cold regions, and two types of equipment can do this - an HRV (Heat Recovery Ventilation) and an ERV (Energy Recovery Ventilation.)īoth HRVs and ERVs are somewhat new to mainstream home construction, and can often be confused. How much fresh air is required in homes and the best way to provide it are important issues. How to choose between an HRV and an ERV?.What is the difference between an ERV and an HRV?.How much fresh air comes in through the building envelope?.This makes mechanical ventilation essential in these high performance home by installing either HRV or ERV Ventilation Exchanger Systems. Buildings and houses are no longer constructed leaking heat and moist air the way they used to be we now build them as airtight as we can, especially Passive House or LEED certified homes. All homes need ventilation, whether natural or mechanical with an ERV or HRV system.
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