1Condenser Coil – Cleaned as required Dirty condenser coils raise refrigerant pressure higher than needed, increasing your electric bill. 2Refrigerant Charge – Checked by superheat/sub cooling method (Thermo charging) A low or high refrigerant charge can easily go unnoticed and increase operating costs up to 30%. An improper charge can cause compressor shutdown. 3Controls & … Continue reading Air Conditioning Checklist