Performed furnace tune up. Furnace turned on and was working. Found air filter to be slightly dirty. Replaced air filter. Recommend using less restrictive air filter and changing once a month. Performed combustion analysis on furnace, furnace passed in all fields. Checked furnace safeties, temp rise, checked flame sensor. Burner compartment is in good condition. Everything checked out good. Furnace is 22 years old. Recommend installing good working CO detectors throughout house. Furnace is passed life expectancy but is still operating safety at this time. Performed A/C tune up. Found a/c to turn on and be working. Hooked up gauges to unit and found low airflow for evap coil. Removed air filter and opened up some vents to get more airflow. Found head pressure to be very high. Cleaned condenser coil with water and chemicals to reduce head pressure. After cleaning coil found system to be low on refrigerant. Recharged system. A/C is functioning but compressor is getting weak and unit is pa