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*From a reputable, local, licensed HVAC Company
Reliable HVAC Company in San Antonio, TX
For decades, Sigma Air has led the way in HVAC excellence. Now, we’re bringing that same quality and commitment to homeowners across Greater San Antonio. Whether you’re dealing with a broken AC, looking to upgrade your system, or need fast emergency help-we’ve got your home covered.
Full-Service AC, Heating & HVAC Repair Across San Antonio, TX
Trusted HVAC Experts Since 1994
Welcome to Sigma Air — where 30 years of industry experience meets a passion for protecting your family and delivering lasting home comfort year-round. What started as a trusted name in multifamily HVAC has evolved into San Antonio’s go-to team for reliable residential heating and cooling solutions, with complete HVAC service including installation, repair, and maintenance. As a local independent operator serving the San Antonio area, Sigma Air stands out in a market that also includes high-volume firms.
We don’t just fix ACs — we bring peace of mind.
Whether you’re facing a sudden breakdown or planning a full system upgrade, our licensed experts deliver fast, high-quality work with expert service and honest service every single time. From your first call to final follow-up, you’ll experience the Sigma Standard: unmatched reliability, transparent pricing, and work done right the first time on every job with professional care. Texas enforces strict laws on who can service or install HVAC equipment, so you can rely on us to specialize in compliant work as a legally licensed company, providing professional service for homeowners and business clients; HVAC contractors need an ACR license, and technicians must be Registered or Certified with EPA Section 608 certification to handle refrigerants. In Texas, a Class A license allows work on systems of any size, while a Class B license limits work to cooling systems of 25 tons or less. Connect with our team, contact us today, or book online.
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AC Repair
Fast, Friendly, and Done Right
No cool air, weak airflow, or warm air from the vents? We get it — when your air conditioner shows these signs, you want it fixed yesterday. Common AC issues include dirty filters and low refrigerant levels. That’s why our local techs offer same-day repairs and dependable air conditioning service, show up when we say we will, and leave your home cooler than when we arrived. A properly working AC should usually cool your home about 15 to 20 degrees below the outdoor temperature. After shutdown, we also recommend following the 3-minute rule to help avoid compressor stress.
24-Hour Emergency HVAC
Because Breakdowns Don’t Wait
Your system doesn’t care if it’s 2 a.m. or a holiday weekend — and neither do we. When your comfort’s at risk, our emergency team is standing by, ready to help, anytime you need us. Emergency calls also include heating repair for faulty furnaces and heat pumps, especially during a cold snap.
Seasonal Maintenance
Comfort That Lasts All Year
Want fewer surprises and longer system life? Routine maintenance helps prolong HVAC and heating system life, and our preventative plans are built for homeowners who’d rather prevent problems than react to them. Common furnace problems often start with restricted airflow from dirty filters. Replacing filters on schedule supports safe furnace performance. Heat exchangers are also an important part of furnace safety and performance checks. One check-up, twice a year — easy, affordable, and worth it.
System Replacement
Out with the Old, In with the Cool
Tired of constant repairs or sky-high energy bills? It might be time to replace your HVAC system. We’ll guide you through the process, from system selection to final install, with zero pressure and total transparency.
HVAC Sales & Installation
A Smarter System for a Smarter Home
Thinking about upgrading your old unit? We’ll help you choose the right fit and proper sizing for your space — whether you need a furnace, one of our heat pumps, or another system, not just the most expensive one. Our systems are energy-efficient, whisper-quiet, and come with honest pricing and flexible financing for a real comfort and cost advantage. SEER2 efficiency ratings are important when comparing new systems. A properly sized high-SEER2 system can lower summer energy use and save money.
Why Choose Sigma Air as Your HVAC Company in San Antonio, TX?
Always-On Emergency Help
HVAC doesn’t take nights or weekends off — and neither do we. We’re here for customers 24/7.
Decades of Trusted Service
We’ve been serving the San Antonio community and the wider San Antonio area, keeping homes comfortable since 1994 — and we’re just getting started.
Licensed, Local, and Reliable
We’re not a call center. We’re your neighbors — and we show up when it counts.
Fast, Same-Day Service
We move quickly — because your comfort shouldn’t have to wait.
No Surprises, Just Straight Talk
Clear pricing. Honest answers. No upsells. Ever.
Discover What a Reliable San Antonio HVAC Company Can Do for Your Home
San Antonio summers don’t forgive a failing AC — and neither should you. At Sigma Air, our licensed, local technicians deliver everything your home needs to stay comfortable year-round: same-day AC repairs, expert system installations, energy-efficient upgrades, and preventative maintenance plans that extend the life of your equipment. With 24/7 emergency service, we’re ready when your system isn’t — even at 2 a.m. on a holiday weekend. Backed by 30 years of experience serving Greater San Antonio, we show up on time, work with transparency, and stand behind every job. Your comfort is our commitment — every season, every call.