Super tune up performed today on a Lennox straight electric system installed in 2016. All electrical connections are tight with no corrosion. Blower wheel and evaporator coil are clean. Heat strips are pulling proper amperage. UV system is working properly. Compressor and condenser fan motor are acceptable. Refrigerant levels are in range. Outdoor unit was washed and waxed. Suggest adding insulation in the attic to help with the efficiency of the home.