Energy Recovery Ventilators are heat exchangers which use the stale air they are exhausting from the building to precondition the fresh air they're bring in from outside to reduce heating and cooling costs.

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Why is ERV (return-return) installation not recommened?

I just had an ERV installed I was expecting the install to be return-return (ie indoor air from return duct pushed outside, and outside air pushed back into return further down the return). The ...