Conducted annual maintenance on multiple HVAC systems. For Goodman GSX130361 3-ton split system, cleaned condenser coil with Nu-Calgon 4291-08, replaced 35/5 μF dual capacitor, and verified refrigerant charge (subcooling: 10°F). Serviced Mitsubishi MUZ-FH12NA mini-split: cleaned indoor coil with Nu-Calgon 4171-75 spray, replaced air filter, and checked refrigerant levels (superheat: 12°F). For Trane XR17 2-stage heat pump, model 4TWR7036A1, performed following: cleaned outdoor coil, tested compressor windings (resistance within 10% tolerance), inspected reversing valve operation, and calibrated TH8321R1001 thermostat. Checked all systems' electrical connections, tightening as needed. Measured supply air temperature drops: Goodman 19°F, Mitsubishi 21°F, Trane 18°F. All systems now operating at peak efficiency.
