Customer has newly installed Goodman heat pump system that operates for whole house. Air handler located in attic. System was not running upon arrival due to matched set/room temperature. System runs until room temperature passes set temperature on thermostat. Explained to customer the operation of thermostat. Made consideration of thermostat replacement for simpler operation. Noticed that system has inadequate return for system size. Water protection is deemed poor. Recommend UV BlueTube to target and prevent biological growth. Replaced 16x20x1 filter. Pressure levels were normal. Condenser electrical components are good. Coils are clean. System is currently working.