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

My technician, Kyle, explained what was needed and was fast and efficient in getting my A/C running smoothly.

Bryan Hermawan’s service was very professional and everything was explained extremely well. Would recommend.

The service was professional and thorough. The service representative, Makayla exceeded my expectations for great service. Thank you.

I have a service plan with McCullough HAC, and it is the best investment I have made for my HAC system. The AC stopped working, and with just one call, I got a next-day appointment. Matt, the technician, arrived right on schedule, made a diagnosis, and fixed the unit; we were up and running in no time! Thanks, guys! UPDATE: Second visit, same as above. Every technician is professionally trained (It shows!) Talking with confidence on the subject gives me peace of mind. New UPDATE—Summer 2025: A same-day appointment is settled! One of the benefits of having a service plan is the ability to rely on professional technicians to resolve our issues. Call McCulloch HAC! Fall 2026: Charles came for the fall-winter check of the HAC system. As always, a detailed and accurate check of the system is conducted, anticipating potential issues that, if not addressed, may result in significant expenses. Highly recommended!

Brian came out and did a thorough and expeditious review of my heating system before the winter weather comes. Thank you Brian thank you McCullough.