Your San Marcos HVAC Company Since 1986

For four decades, SM Air has served San Marcos and the Austin–San Antonio corridor with honest, careful HVAC service built around customer comfort, safety, and trust.

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About SM Air

SM Air has been serving San Marcos and the surrounding communities since 1986. What started as a local heating and cooling company has grown into a team homeowners trust when the house is too hot, too cold, too humid, or just not as comfortable as it should be.


We believe good HVAC service should make things easier, not more confusing. That means showing up with care, explaining what we find, and helping you make the right choice for your home.

White SM Air HVAC service van parked on a street with a red ladder on the roof.
Technician in gray uniform points at a duct component in an unfinished basement with exposed HVAC ducts.

Our Motto

It's more than something we say. It is the standard we try to bring into every service call, every conversation, and every home we visit.


For us, doing more means listening carefully, explaining clearly, and taking the extra step when it matters. It means treating people honestly, standing behind our work, and helping homeowners feel confident about their next decision.

We Do More Because We Care

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What Homeowners Notice

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Matthew was my technician! He was prompt and professional, and provided great recommendations on what I should get done for my AC.

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Jhenisse M.

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Jared was the tech that came out to service our units. He was great! Professional, clear communicator and efficient!

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Monica F.

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David, at SM Air A/C is both very professional and friendly. He is prompt and keeps me informed fully regarding his work on my A/C system.

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Steve K.

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Jarred with SM Air is always very professional, knowledgeable and goes Above and Beyond answering questions and sharing maintenance tips.

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Jennifer C.

Want to Work With the Team at SM Air?

Our business is built around people who care about the work, the customer, and the home they are walking into. If you take pride in showing up well, solving problems, and being part of a team that does things the right way, we’d like to hear from you.

Have a Heating or Cooling Question?

Tell us what has been happening at home. Whether you need service now or are trying to plan ahead, SM Air can help you figure it out.