Arrived to find mismatched system Client has a Goodman 410a straight ac condenser paired with a r22 air handler. Client has a r410a Goodman air handler they wish us to install. Also on property clients were having issues with another apt not cooling well. Investigated to find duct board distribution chamber completely compromised and ventilation is more in attic space rather than home. In order to replace this they would need to remove Sheetrock and I suggested to abandon the box and install all new supply air grills, boot boxes and flex duct to locations in home for better comfort and efficiency. Sent all estimates to be viewed by owners