San Antonio's trusted heating & cooling — quality work, fair prices, and people who actually pick up the phone.
Everything you need from one trusted local team — done right the first time.
Fast cooling repairs and high-efficiency system installs.
Furnaces and heat pumps serviced, repaired, and replaced.
Seasonal tune-ups that prevent breakdowns and extend system life.
Filtration, humidity, and ductwork that keep your air clean.
Comfort can't wait — we're available around the clock.
Flat-rate quotes before any work begins. No surprises.
No runaround. No pressure. Just honest work and clear communication.
Call or request a free quote. Tell us what you need — we listen first.
We assess the job and give you a clear, written price. No pressure, ever.
Our crew gets it done right, on schedule, and leaves your property clean.
Sigma Air has earned its name across San Antonio the right way — one happy customer at a time. Call and you get straight answers, fair pricing, and work that holds up.
A look at the kind of quality you can expect.
"Anthony did a great job diagnosing and fixing our AC issue. We had a refrigerant leak causing poor cooling, and he quickly identified the problem, explained everything clearly, and got the repair handled professionally. What really stood out was the customer service — while waiting for the Carrier warranty part to arrive, they provide…"
— Deepak Subramaniam · a month ago"This was my first time using Sigma Air Heating and Cooling, and I would give them a 10 out of 10. They are professional, knowledgeable, and focused on getting the job done right. They explained everything step by step and kept me informed throughout the process. Their pricing was very reasonable, and they didn't try to pressure me into…"
— Matthew Perales · a month ago"Anthony was amazing. Quick turnaround and efficient process all around. I contacted Sigma on a Saturday around 9am, a tech was at my house by 12. Professional, polite, and quite honestly the issue was something I should have caught myself but Anthony didn't make me feel silly for it. He took his time, thoroughly inspected everything to…"
— Katlynne Garcia · 2 months ago"I can honestly say I've never had such incredible service from an AC company before. David is a credit to his company. He was professional, intelligent and he knew exactly what he was dealing with. David handled the job quickly and went above and beyond. I would highly recommend Sigma to anyone who's tired of the usual AC companies…"
— B N · a month ago"Sigma Air installed a mini split in my wife’s backyard office. They were fast, efficient, and very friendly. We contacted them through Thumbtack and they were very responsive. We knew what was going to happen every step of the way. The unit is so quiet and blows super cold. Great job!"
— John Casarez · 3 months agoFrom San Antonio to the surrounding towns, Sigma Air is just a phone call away.
Yes. Sigma Air is fully licensed and insured, so you're protected from the first call to the final walkthrough.
Absolutely. We provide free, no-obligation quotes throughout San Antonio and the surrounding area.
Twice a year — once before summer and once before winter. Regular tune-ups keep efficiency high and catch small issues before they become big repairs.
Often within days. Call and we'll get you on the schedule as quickly as possible.
Tell Sigma Air what you need — we'll get right back to you. No pressure, no obligation.
📞 Call +18636704969We’re so confident in what we do that we put the risk where it belongs — on us, not you. If we can’t attribute 2× what you invest within 90 days, we give you the difference back in cash, cancel your service, and hand you the website — code and all. You genuinely own it. Best of luck.
We built this whole website for Sigma Air — free. The AI assistant in the corner answers every call and web chat and books jobs straight onto your calendar, 24/7. Add a free CRM so no customer ever slips through the cracks.
We've reserved this website for Sigma Air through August 15. When this round fills it goes to $397 — and unclaimed sites come down.