HVAC Services in San Marcos, TX

Your Comfort Is

Just a Click Away

One Hour Heating & Air Conditioning® Serving San Marcos

4.84

(160265 reviews)

Your home’s comfort depends on a heating and cooling system that can handle it all. When your AC stops working or your heater starts making strange noises, you don’t just need help—you need it fast. That’s where One Hour Heating & Air Conditioning® comes in. We’re proud to be the trusted team local families in San Marcos, TX, rely on for everything from seasonal tune-ups to emergency HVAC service. With fast response times, honest pricing, and technicians who truly care, we make it easy to keep your home comfortable. Contact our friendly team of HVAC experts today for fast, trustworthy service!

What Makes One Hour® the Top Choice in San Marcos?

Plenty of companies offer AC services or heater repairs. But at One Hour Heating & Air Conditioning®, we believe it takes more than just technical skill to earn your trust. It takes showing up on time, respecting your home, and delivering great results—every single time. Our team earns your trust at every turn from booking to cleanup.

Here’s How We Earn Your Satisfaction:

Always On Time… Or You Don’t Pay a Dime!® – When you book an appointment, we respect your schedule. If we don’t arrive within the time window you selected, your service fee is on us.
Transparent Pricing – With our Straightforward Pricing® Guide, we’ll walk you through your options and give you an honest quote—no hidden fees, just clear, upfront pricing.
100% Satisfaction Guarantee – Every repair, replacement, and installation is backed by our 100% satisfaction guarantee. We want you to feel confident in our workmanship and in the performance of your HVAC system.
Trained, Certified Technicians – Our technicians are background-checked, drug-tested, certified, and continuously trained to stay up to date on the latest HVAC technology and methods.

Trusted HVAC Services in San Marcos

At One Hour Heating & Air Conditioning®, we don’t just fix problems, we help you prevent them. Whether your system is brand new or showing signs of age, our team offers personalized heating and cooling care to keep it running as efficiently as possible. We handle everything from full system installations to annual tune-ups and troubleshooting. No matter your home’s size, layout, or system type, we’ll tailor our approach to fit your needs and budget. Our team travels with a fully stocked truck so we are able to fix more issues in a single visit, getting your home back up and running quickly!

Our Heating and Cooling Services Include:

We Serve All of San Marcos!

Our team lives and works right here in San Marcos, and we care about the families we serve. That means showing up when we say we will, treating your home with respect, and making sure every service is done to the highest standard. No matter where in San Marcos you live, you can count on One Hour Heating & Air Conditioning® to deliver outstanding AC services.

Communities We Serve Include:

Eastern Neighborhood
Heritage Neighborhood
Northern Neighborhood
Northwest Hills Neighborhood
Western Neighborhood
Willow Creek Neighborhood

Contact One Hour Heating & Air Conditioning® Today!

There’s no good time for your San Marcos HVAC system to stop working—which is why our team is always ready to help with 24/7 emergency HVAC service. One Hour Heating & Air Conditioning® is proud to have a team that never stops learning, bringing you the most up to date techniques to solve your heating and cooling issues. Call One Hour Heating & Air Conditioning® in San Marcos today and see why we’re the heating and cooling company more homeowners in San Marcos trust.

We Have a Reputation

For Being Punctual, Friendly and Knowledgeable

4.84

(160265 reviews)

Mallory Vivar

in the last week

“Had to reach out to an A/C company, had no idea who to choose but took a chance on One Hour Ac & Heat. Came out to our house at 1am, got us fixed up and signed up for yearly maintenance. Professional all the way around. Thank you so much! Highly recommended!!”

Adria Thomas

in the last week

“Brian did a great job. He was very professional and knowledgeable of his job. I had an appointment for a couple of days later. He called me the next morning saying he was coming that day to repair my a/c and I appreciate it because my house was hot. Brian did a great job!”

SaKarsha SanchezHunter

in the last week

“Spencer provided outstanding HVAC service—he was patient, caring, and incredibly personable throughout the entire visit. He took the time to explain everything clearly, making sure I understood each step of the process. His professionalism and attention to detail were evident, and I truly appreciated how informative and thorough he was. Spencer went above and beyond to ensure I felt comfortable and confident in the work being done. It’s rare to find someone so knowledgeable and genuinely committed to excellent customer service. I highly recommend Spencer for anyone needing trustworthy, top-quality HVAC support.”

Nat Le Narvor

in the last week

“Yesterday, the issue was diagnosed. AC unit needed to be replaced. The team came this morning to install the new unit (inside and outside) and again, they were all very professional, did a great job. Very friendly technicians. They explained the difference between the new unit and the old and shared advice on how to best operate the AC. I highly recommend the service of this company! And my house is called again😃”

Jackie P

in the last week

“Great company! Reliable, responsive and incredibly knowledgeable. They were able to accommodate us same day, thoroughly explain the issue I was having and remediate quickly. Thank you so much for your expertise and professionalism!”

Vernon Fawcett

in the last week

“Nick was amazing. He completed the requested service and also provided some recommendations that we appreciated. Nick was thorough and we're very pleased with the work that was completed today.”

Saundra Middleton

in the last week

“I am very pleased with this maintenance service I received from One Hour Air Conditioning The technician Roberto was very professional and pleasant. He called to let me know he was on his way greeted me at my door, also, he asked if I had any concerns or special needs for his visit. He went right to work cleaning my outdoor unit and also taking care of the unit in the garage Also had great suggestions regarding what type of filter to place in the unit. thank you, Roberto. we’ll see you again in three months.”

Michael Puglise

in the last week

“I actually had One Hour do some work last year and they were out again this year. I really appreciate the fact I can call these guys and they'll show up the same day. That really helps, especially in this Texas heat. I had the same technician, Brent, nearly exactly a year later. He's patient, answers any questions I have, gives me tips on how to maintain the system and got me back up and running. I'll keep coming back here for my HVAC needs because I can depend on them. Im giving the 5 star specifically for Brent. I appreciate the business model and always getting there in a timely manner, their costs are just higher than most others.”

Keith Maholic

in the last week

“Anthony Romero Came out to my Home and it was very nice to have a service tech explain everything that he was checking and doing. Explaining what was wrong and how the service plans that were available and how they worked. Tony was very efficient he had the Blower motor replaced within a hour after he showed up very quick and would highly recommend him and Mitchell Heating and Air Conditioning Service.”

Bret Martin

in the last week

“Davis was amazing. Knew what was going on as soon as o told him. He was very professional and did not try to sell me stuff that I did not need. Will go back again if and when I need too.”