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    Credit: Joel Tantay

A heat recovery ventilator (HRV) works best when flow is balanced: when an equal volume of air is moving through the supply and exhaust. It can be thrown off balance by factors that range from duct runs of unequal length, to a powerful rangehood that creates a slight vacuum in the house, to a strong wind blowing against the wall. The Self-Balancing HRV Deluxe Series solves the problem with electronic air-balancing technology. Internal circuits measure airflow and constantly adjust the speeds of the unit’s two motors. Cost: $1,155. Reversomatic, 800.810.3473, reversomatic.com