Agree to customer upon arrival, customer led me to the units downstairs in the basement which is one furnace and one air handler. There's also a unit in the Attic. Two thermostats on the first floor, smart thermostat for heater, old thermostat for ac. One thermostat upstairs inside of a bedroom. Air handler downstairs filter is pulverized the attic is not. Filter for upstairs unit is in a return register in the hallway on the ceiling. Both units temperature difference were tested with temperature probes. Basement unit temperature peaked at 14° difference while attic peaked at 16° difference, it was 60° F outside at the time. Wash down condensers with just water outside. Changed pulverized filter, customer said she changed the filter for upstairs.
