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! Special financing for up to 6 years. Subject to credit approval.
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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

$100 OFF
on your next repair
New Customers Only. Minimum Repair total of $500 required.
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Expires: 4/30/2026

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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

2 days ago
Vikram Iyengar
Clayton and McCullough were most friendly, respectful, honest, and helpful. Highly recommended. Had a great experience with Bryan Hermawan.
2 days ago
Michael Hutchison
Josh was great. Punctual and super thorough! Very happy! Thanks!
2 days ago
Dennis Gregoire
Blake was very courteous and efficient in performing the annual inspection of our A/C system, including indoor and outdoor components, and preventative clearing of the drain line with pressurized air.
3 days ago
Steve Demarest
The technician, Joshua was thorough, knowledgeable, and professional. This was an “introductory” visit addressing 3 systems and Joshua completely checked each system, both inside and outside. We are confident our HVAC systems are in good condition and ready for Texas summer.
3 days ago
Gregory Wehmeier
Got a routine service. Miko did a great job, explained everything to me, and made sure to keep thorough notes for the next time.
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