Too weak HVAC v. disconnected main line 12 with black insert not pulled out

Hello, I didn’t have air flow in half my home after a “new” HVAC was installed. for perhaps 14 months.  The HVAC contractor sold me a used weak 35CFM unit… Hello, I didn’t have air flow in half my home after a “new” HVAC was installed. for perhaps 14 months.  The HVAC contractor sold me a used weak 35CFM unit…Read MoreGreenBuildingAdvisor