Performed maintenance on HVAC system today. Observed 20° temperature split between 57° supply and 77° return air, indicating good performance. Inspected evaporator coil visually obstructed. Ensured clear primary drain line. Cleaned flame sensor and verified proper operation of all gas safety controls. Megohm testing confirmed compressor windings within acceptable range. Condenser fan run capacitor in good condition. No major deficiencies found, system operating satisfactorily.