Performed diagnostic on 15yr old Rheem heat pump with 9yr old carrier air handler, upon arrival customer stated two front rooms are always cold during winter and hot during summer, also stated mast bedroom is way hotter ir cooler then other rooms, living room is always cooler then what tstat is reading,check tasty, hacked to heat mode, upon going in attic founn2.5 ton unit with only 800 cam return with 845 cam supply, unit requires 1000, recommend duct modifications to help balance airflow, explain to customer low airflow nd unit efficiency plays a major roll in comfortability, check filter, evap coil impacted, recommend cleaning, blower wheel impact, recommend cleaning, recommend TE flood protection such as wet switch, recommend high power uv protection to help with organic growth, inspected outdoor unit, recommend cleaning condenser coil, found contractor failing, recommend replacing,explain can fail at any moment, check defrost, pressure and temp split, unit is working at time but