Really old unit electric heat is operational but old filters were on package unit causing a restriction on return The filters were full of Sheetrock dust, evaporator coil has all this Sheetrock dust stuck on the fins and even if it gets cleaned with coil cleaner it won’t be much difference after it is sprayed down since the Sheetrock acts like glue when gets stuck on evaporator coil. Unit is full of mold on blower and blower section I highly recommend changing out this unit The customer will definitely have issues with their cooling this season Sent estimate on repairs per Toby Bill out