On arrival nothing was functioning including indoor fan. Homeowner advised that he recently replaced the thermostat. Corrected a minor wiring issue and tested the system for heat, fan on, and air conditioning. Everything is currently operational. Due to the age of the air conditioning unit, we do not want to perform any system maintenance at this time. Chud would recommend upgrading the equipment at some point. Furnace is a 2014 model. Ac coil and condenser is a Nortek product that runs on R-22 style refrigerant. We will address any service issues as they arise. (3 ton condenser and coil). Heil Furnace M#G8MTL0901714A1, S#A135120780. 16x25x1 filter. We will provide maintenance services on the furnace since it is newer than the ac portion.