Arrived at residence and found Lennox/York split system heat pump completely frozen with a dirty/rusty indoor coil. Also noted the mismatched indoor coil with 410A condenser on the system, causing multiple issues for cooling efficiency. Thawed coil and cleaned indoor coil and drain pan. Performed cooling checklist for the system and noted the start capacitor installed for the compressor. Scheduled for comfort consultation for the air handler unit. System set to cool to 70 degrees.