Completed installation of an HRV. Ducted the HRV unit to the furnace return duct, and to an intake and exhaust hood that penetrate the basement walls to the exterior of the home. Installed the control on the wall under the thermostat and ran wire to the HRV. Also ran a 2 wire to the furnace to interlock the HRV to the furnace fan. Run tested the unit but will schedule a time for Rick to come do a walk through. Thank you for choosing Black-Haak Heating and Electric. Please take a moment to fill out our online survey.