Removed old 4-ton condenser and air handler remounted new Coleman 4-ton air handler one piece re-hooked up wiring drain piping and supply duct. Also hooked up refrigeration piping. Need to make a 19 and 1/2x20 return box and pick up two 12-in collars. Also re-hooked up condenser outside. Perform pressure test evacuator system and pre-charged need to do startup next time we come. Installed new return box. Install two 12-in return flexes relocated for supplies to 8 in and two 6 in and put in new register boxes in the ceiling. Need to return for registers when sealing is higher