OPACHS Air Conditioning and Heating Service. When you want to stay cool in the summer and warm in the winter, there’s not a better choice in Memphis or DeSoto County than Opach’s Air Conditioning and Heating Service. Opachs brings more than 15 years of extensive experience in commercial, residential, installation, service and repair of heating and air units, gas piping and water heaters. Opach’s is a licensed, bonded and insured full-service HVAC contractor in excellent standing with the Better Business Bureau.