Arrived onsite for ac maintenance; homeowner elected to only have maintenance completed on 1 system first floor . Asked customer to turn AC on to confirm operation. Checked all electrical. Chemically Cleaned outside coils, measured pressures for 410a at 113/200psi with 2.3 degree sub cooling with outside temperature at 65 degrees. Measured temperature drop at 18 degrees. Cleaned evaporator coil and condensate line.. System running as it should. Homeowner mentioned booming noise…appears to be on startup from the filter return box. Maybe we could reinforce.
