Trusted Heating & Cooling Services in Round Rock, TX Since 1977

100% Satisfaction Guaranteed
STILL Locally Owned and Operated
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512-280-0011
0% financing for 72 Months with approved credit

Our Services

Heating

We offer heating services that keep your home warm and energy-efficient all winter long. Our team provides reliable solutions that ensure your system works smoothly. You can trust us to take care of all your heating needs with friendly, professional service.

Air Conditioning

When it comes to cooling your home, McCullough Heating & Air Conditioning has you covered. Our experienced technicians are ready to handle all your cooling needs, keeping your home comfortable and energy-efficient even during the hottest months.

Home Energy Audits

For detailed home energy audits, rely on the experts at McCullough Heating & Air Conditioning. We’ll evaluate your home’s energy use, pinpoint areas to improve, and offer solutions to boost comfort while lowering your energy bills.

Financing options available

We Live Here, We Give Here! 0% financing for up to 6 years
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Experience the McCullough Difference

More Than a Service Call—Comfort You Can Count On
  • Trusted Service Since 1977
  • Expert Installation & Quality Repairs
  • Flexible Financing & Satisfaction Guarantee
  • Reliable, Local, Transparent Service
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Quality Service Recognition by Leading Organizations

Proudly Serving Round Rock and the Surrounding Areas

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Join our maintenance plan

Ensure Your Equipment is running smoothly Year-Round
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WHAT YOUR NEIGHBORS ARE SAYING ABOUT US

4 days ago
Eugenie Bagur Long
What a fantastic experience! Our air conditioner stopped working and after meeting and getting a quote from a popular company we decided to get a second opinion on options and costs. Henry Harris knows his stuff! He- and the rest of the McCullough team- are professional, communicative, prompt and extremely knowledgeable. Henry was a pro and the company was great to work with and we didn’t feel “zip coded” in their quote. In less than 24hrs after meeting, our air conditioner was running, again. Thanks, McCullough Heating and Air!
5 days ago
Bo Spencer
great service and very prompt!
5 days ago
Ronald Glickman
Charles was an extremely professional and friendly tech. He respected our home, answered all questions in an informative and friendly manner, and was very thorough with his work. Can’t recommend the company and Charles enough
6 days ago
Jennifer R.
Clayton was our tech for a recent AC outage due to a clog. Besides fixing the issue, he gave me tips on preventing the problem in the future, and reminded me to order filters. Great guy & good service.
6 days ago
James A Neely
Fantastic job in replacing my HVAC system. Work was done with a minimum of household disturbance and my system is performing excellently!!
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