Top Thermostat Replacement & Repair Services in O'Fallon, MO

At first I was very pleased with Greg's work and he was very willing to come out and fix anything I found. The last part of the job was instilling the shutters. Once they were installed I thought the job was complete and would not have to contact Greg. I ...

Greg's did a quick and professional job on replacing a portion of my gutter on a day when I figured the weather would keep him away but when I arrived home the job was complete!

I hired this company to install an exterior basement door, which they did. They did not, however, bring enough materials to finish the job. I finished caulking and resetting the lock so my door would close all of the way. I asked them if they could ins...

They are very professional and the serviceman are very knowledgeable. They are also affordable.

Outstanding, wonderful people to talk to.

Professionals from start to finish. Responsive to my call and efficient in fixing my air conditioner problems. I always look to give my business to a minority-owned company and was completely satisfied with the top-rate work they performed.

Outstanding service and reliable! We get a clean & check every spring and fall from them. They even helped us receive and Ameren rebate!

This company installed a humidifier on my furnace and it was the best investment I have made in my house to date. The service was very professional and customer oriented. My schedule is pretty hectic and they were really accommodating. I highly recommend ...

Williams Heating & Cooling was so easy to work with. I received very fast and incredibly courteous service from every single person I worked with. I had an emergency with no heat and they immediately stepped in to help me without charging me a crazy am...