We are renovating a 12 (one bedroom) unit elderly complex with a direct vent hot domestic hot water system and electric heat. The units are 530 SF. Our work includes adding 3″ of rigid insulation to the exterior, adding an additional 12″ of insulation to the attic space and going after air infiltration discovered in a blower door test. We are thinking of adding a small 40 CFM ERV to the system but are worried about dryness and effectiveness of energy savings.
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