Customer called and said her Thermostat wasn’t working. The indoor was blowing but the outdoor wasn’t. I checked outdoor and saw the capacitor in bad condition but still tested good. I went to the thermostat because it was still blank. The batteries were installed incorrectly. Switched the batteries around and thermostat came on. Unit started cooling. Unit low on refrigerant. 17 year old American Standard Outdoor with a Lennox Slab coil and Amana Furnace. Customer was interested in getting estimates for replacement of at least coil and condenser. Left her 4 estimates. Collected $95