Arrived on site for maintenance. Checked air handler in attic. Some rust on evaporator coils. Unit was already running cooling. Condenser ran normally. Due to an incident, another company (irrelevant to hvac) accidentally ruined a line set. "Fixed" issue but instead of refilling unit with R22, they refilled it with R438A. Pressures were ok. Superheat a bit high. Delta T: 15 degrees Washed down condenser with chemical and water. Customer seems interested in a new unit, possibly a mini split. Updated customer with information/status. Customer acknowledged and signed off.
