I am a professional HVAC technician who works for a company called Dor-Mar Heating & Air Conditioning. I recently completed an AC maintenance job on a split unit. The unit was operating at a 18-degree temperature, and I came back this morning to fix an insulation issue on the outdoor unit. The Freon levels were great, and the unit was clean both inside and outside. I am glad to report that the unit is now operating at a comfortable temperature.