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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Don’t Miss Today’s Offers

New Heating and Cooling System
as low as $108/Month
+ Potential Federal Tax Credits
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Expires: 6/30/2025

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Quality Service Recognition by Leading Organizations

Proudly Serving Austin 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

3 days ago
Cliff Culver
Sean very professional and knowledgeable and excellent work habits. Glad to have him working on our system. If need work in the future recommend him highly.
3 days ago
Pat Niekamp
We use McCullough for our annual inspections for heating & cooling. We were lucky enough to have Brian as our tech for this year's cooling checkup. After mentioning the air conditioning drain (which runs through the master bath sink) needed a bit too much Draino this spring, he cleared all the backup which turned out to be more clogging than expected. It's that extra step that keeps us coming back. Thanks, Brian.
3 days ago
Marc Zook
Junior De Jesus was the best McCullough service person we’ve had over the past few years. He was kind, courteous and one could see his experience, offering very helpful info. He also helped us program our EcoBee thermostats to our desired specs, and was kind enough to change out our whole house filters and carry away the used ones…. McCullough and Jesus are awesome!! Highly recommended!
3 days ago
Jane Lewis
Guillermo was pleasant, worked efficiently, put items back that I had cleared so he could get to units. mccullough has been my go-,to for hvav needs. Guillermo is an example of why
3 days ago
Eric L
Great service. I believe he solved teh issues. Very Friendly.
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