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Comfort in San Marcos doesn’t need to be expensive, difficult, or anything less than ideal. No matter the hot, humid summers or windy, cold winters, Relentless Cooling & Heating LLC provides affordable, convenient, and effective solutions to residential and light commercial needs. We look forward to surprising you in a really good way. From prompt response and organized job sites to clear communication, fair treatment, and exceptional quality of workmanship, we are the choice that delivers a rewarding process and results.

We’re Here for You in San Marcos

As a family-owned HVAC business, we take a great deal of pride in living up to our name. We are tireless in our efforts to prevent and solve problems with energy-saving, reliable, and innovative opportunities. We answer the specific requirements of homes and commercial buildings with a progressive selection of central air conditioners, furnaces, heat pumps, ductless mini- and multi-split configurations, VRFs, and the ideal fit. As an Elite Tempstar Dealer, we’ve got you covered.

Ready to Provide Reliable HVAC Service

Relentless Cooling & Heating LLC is your prompt, knowledgeable, and dedicated source of a full suite of HVAC expertise, including all-important seasonal maintenance, skilled repairs, whole-home indoor air quality accessories, smart thermostats and ductwork sealing, cleaning, repairs, and preventive upkeep. Combining more than three decades of industry experience, no challenge is beyond our capabilities. Call us for assistance at (830) 282-4633 anytime. We remain available for emergency response 24/7 in San Marcos and the surrounding areas.

Furnace Service, Air Conditioner Service, Heating Service, AC Service & Heater Installation in San Marcos, TX

AC Company in San Marcos, TX | Heater Installation

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Special Offer


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With Paid Repair

Exclusions apply. Call (830) 282-4633 for details. While supplies last.

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Rated 5/5 on Google!

Shout out to Relentless Cooling and Heating!! Their affordability and timelines is outstanding! I highly recommend them for all of your AC needs!

Brandi M.

We were referred by a friend to call Relentless and thank goodness for them! They were honest and upfront and even let us know our system was probably still under warranty, which it was.

Nicole D.

They were very responsive and communicated with me at all points, very reasonable and fair rates. I have used them for several of our rental properties and do awesome work as well as clean up after job is complete.

John Z.

These guys have a great attitude and awesome work ethic. They’ll go above and beyond if they have to and when needed! They tackle projects head on and the end result is always quality work!

Chris S.

Very professional and honest, extremely knowledgeable gives great information about what’s going on. Thank you for the help Relentless cooling and heating.

Nina B.

Thank you for replacing my ac and all the work you did to fix my ductwork. Cruz is very reliable, friendly, and knowledgeable. And affordable.

Ana A.

Man I cannot thank Danny enough!!! He came and fixed the A/C real quick! It has been out for months. Not to mention how quickly he came out to service us.

Saul C.

Best in the game. Top of the line work and for a respectable price. Highly recommend them for all of your HVAC needs.

Erik S.

Called the company in the morning after realizing the AC had gone out and by 11:30 that morning AC was working again. Very impressed, so we will have them come back for routine maintenance.

Natalia O.

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