HVAC Installation in St. Louis
A new HVAC system is only as good as the install behind it. We size it right, seal the ducts, and commission every system so it delivers the efficiency you paid for — for years, not months.
HVAC Installation in St. Louis
More than half of the comfort and efficiency problems we see in St. Louis homes come from systems that were installed oversized, undercharged, or with leaky, poorly designed ductwork. We do it differently. Every installation starts with a Manual J load calculation so your new system is sized to your home — not a guess based on square footage. We install furnaces, air conditioners, heat pumps, and packaged units from Carrier, Trane, Lennox, Rheem, Goodman, and more, and we seal and test the ductwork as part of the job. After installation we commission the system — checking airflow, refrigerant charge, and static pressure — so you actually get the SEER and AFUE ratings on the sticker. Every install is backed by manufacturer warranties plus our own workmanship guarantee.
Signs You Need Installation
If any of these sound familiar, it's time to give us a call.
What We Handle
How It Works
Free in-home estimate
We measure your home, inspect your ductwork and insulation, and run a Manual J load calculation to size the right system.
Options & pricing
You get 2–3 equipment options at different efficiency tiers with clear, fixed pricing — plus financing options if you want them.
Professional installation
Our crew removes the old equipment, installs the new system, and seals and tests the ductwork — typically completed in one day.
Commissioning & walkthrough
We verify airflow and refrigerant charge, register your warranties, and walk you through the new system and thermostat before we leave.
HVAC Installation in St. Louis — Common Questions
What St. Louis Customers Say
Real reviews from homeowners across the metro who trusted us with their HVAC.
"Our AC went out on a 97-degree day and STL Air Pros had a tech at our house within two hours. Fixed a blown capacitor on the spot, explained exactly what failed and why, and the price was totally reasonable. Won't call anyone else."
Marcus Thompson
Webster Groves, MO · May 2025
"Replaced our 18-year-old furnace with a new high-efficiency unit. The crew was on time, professional, and cleaned up completely. They also caught a small carbon monoxide issue with the old heat exchanger — probably saved our family from a serious problem."
Diane Reynolds
Kirkwood, MO · March 2025
"I've used three different HVAC companies over the years and STL Air Pros is in a different league. Straight answers, no upselling, competitive pricing. My maintenance plan has caught two small issues before they became expensive repairs."
James Kowalski
Chesterfield, MO · January 2025
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Read articleHVAC Installation Across the St. Louis Metro
Dedicated hvac installation pages for cities across St. Louis, St. Charles, and Jefferson counties.
Ready to Schedule Installation?
Licensed, insured, and ready to help across the St. Louis metro. Call now or request a free estimate online.