Customer called for air conditioning system not operating. Customer stated the system was blowing warm air but also noticed a time it was calling for air but did nothing. Chud was out in summer 2020 and found they first floor system low on refrigerant charge. We added 2lbs of 410A refrigerant as a first time fix. Customer had another company out in the spring 2022 and found it low again as well as water on the floor most likely due to frozen system. Upon inspection today we turned it on at the thermostat and it started cooling without issue. Tested the temperature split and it was at a perfect 20°. Did some further testing to see if I could replicate the issues the customer was having. Found pressures in the recommended range by York. Pressures were at 119/278 with a subcooling of 7°. Customer could also have a possible intermittent issue with the thermostat. Customer did change the batteries and it seemed to be working fine since. Attached is an estimate for thermostat replacement.