Greeted customer upon arrival. Customer led us to the thermostats upstairs and downstairs. Customers directed us to the air handlers that's in the basement and upstairs. Changed filters, went outside and washed the condensers with chemical and water. Went inside took the temperature difference from the air handler putting one temperature probe into the return vent and the other Supply temperature probe in a supply vent. Upstairs unit temperature difference peaked at 17 degrees Fahrenheit and the downstairs unit peaked at 20° f. Customer said they haven't had any issues as of yet with any units.
