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Performed precision ac tune up on lennox ac. Found clean 16x25x1 air filter. Also found that thermostat switch on older Aprilaire thermostat is going bad and no always switching correctly, recommended replacing with Honeywell t4 programable thermostat. Homeowner is going to let husband know about issue. Also found mouse nest in outdoor unit cleared out and found no wires chewed at this time but could happen in the future. Checked all other electrical components and connections. Checked refrigerant pressures and temperatures at indoor and outdoor units. System is working fine at time of service.