Came out for Heating Inspection on 2 Goodman AC/NG 80% Furnaces. Made customer aware due to being below 60 degrees cant accurately depict how well and efficiently air conditioners are cooling. Found upstairs furnace (80,000 BTU for roughly 1400-1600sq ft) oversized for current application. It is constantly tripping high limit then resetting then repeating this cycle. This does not heat as efficiently as intended and over time this will wear out equipment faster. Main recommendation is to replace with proper sized furnace for maximum comfort and efficiency. Gas line currently not strapped properly and ran in front of blower fan housing. Can be an issue in future if repairs are needed. Recommend supporting properly and routing away from furnace door. Found return ducts with missing insulation, recommend replacing. Current AC coil in attic is 2 ton while outdoor coil is 2.5 ton. This can cause humidity issues having indoor coil sized smaller than outdoor. Recommend also sizing this proper