Home:: Company:: Estimating:: Safety:: Contact Quality Heating and Air-Conditioning Inc Formed over 40 years ago, Quality Heating and Air- Conditioning Inc. has been a well respected HVAC mechanical contractor in the St. Louis Metropolitan area. Incorporated in 1972, Quality Heating and Air-Conditioning Inc specializes in commercial, industrial and institutional projects, both new and remodel. We are pleased to offer the following services to our customers: