As of 2020, DeHart Air Conditioning has 100 years of experience in the business. As a fourth-generation family-owned HVAC com ... pany and a full service dealership of more than 25 employees, we know the Chickasha and Duncan area and what homeowners and commercial property owners in the region need. From the steamy summers to the chilly winters here in Grady County, our team of heating and cooling experts understand how difficult it can be to stay comfortable. That’s why our caring team of expert HVAC professionals will make sure you stay cool during the summer heat and cozy during the winter. DeHart is determined to make your home or commercial property comfortable and healthy, the Dehart way. read more