We have been using https://www.gormanmechanical.com/ since moving into new house in Flower Mound. Previous owner used them and they also used them for their small commercial businesses. So far I have been impressed. Competent, on time, and willing to work with you on costs. He have 4 systems at the house so we pay for the service plan for peace of mind. They are out of Azle I believe.
Second Burke Mechanical he does great work and is trustworthy. We have used him for a while and brought him on a small remodel and he saved us from making what would h e been a big mistake. I believe his wife is an Ag as well.