Air Conditioning Repair, Installation & Replacement in St. Louis, MO
Expert AC repair, installation, and maintenance from a locally owned St. Louis HVAC company — honest answers, no upsell.
We keep St. Louis homes cool through the hottest summers. From a system that won’t turn on to a full new installation, Thomas Hoffmann Air Conditioning & Heating is available 24/7 — including emergencies.
30+ Years
Experience
Master Technician
Locally Owned & Operated
24/7
Emergency Service
Thomas Hoffmann Air Conditioning & Heating is St. Louis’s locally owned source for AC repair, installation, and replacement. With over 30 years of hands-on experience and a Master Technician leading every job, we handle every brand, every system size, and every level of urgency — including 24/7 emergency calls.
Unlike national chains operating under local-sounding names, we’re a true St. Louis company. Thomas Hoffmann is personally involved in the business, and our technicians give you honest answers — not an upsell on parts or a system you don’t need.
24/7 Emergency Service
AC Repair in St. Louis, MO
When your air conditioner stops working in the middle of a St. Louis summer, you need a fast, accurate diagnosis — not a guessing game. Thomas Hoffmann Air Conditioning & Heating dispatches certified technicians around the clock, including nights, weekends, and holidays. We identify the problem on the first visit and give you clear, honest repair options before we touch anything.
Call (314) 471-7625 any time. Emergency calls are answered directly — not by an answering service.
Common AC Problems We Diagnose & Fix
AC not cooling
Running but blowing warm air — often refrigerant, compressor, or airflow issue
AC won’t turn on
Tripped breaker, failed capacitor, thermostat issue, or electrical fault
Frozen evaporator coil
Restricted airflow or low refrigerant — left untreated causes compressor damage
Refrigerant leak
System loses cooling capacity — requires leak detection and proper recharge
Unusual noises
Banging, rattling, or squealing — motor, belt, or loose component problems
Short cycling
System turns on and off rapidly — often refrigerant, electrical, or sizing issue
We Service All Major AC Brands
As an authorized Trane dealer, we have deep expertise in Trane systems — but we repair and maintain every major brand including Carrier, Lennox, American Standard, York, Amana, Goodman, Rheem, and more. If it cools your home, we can fix it.
Authorized Trane Dealer
AC Installation & Replacement in St. Louis
Whether you’re replacing a system that’s reached the end of its life or installing central air for the first time, Thomas Hoffmann Air Conditioning & Heating helps you find the right system at the right price. We have over 30 years of installations across the St. Louis metro — we know what works in our climate and what lasts.
Most residential installations are completed in a single day. We give you a clear timeframe before we start, keep the work area clean throughout, and make sure your system is running and properly calibrated before we leave.
Should You Repair or Replace Your AC?
We’ll give you a straight answer based on your system’s age, the cost of the repair, and its efficiency. As a general guideline: if your system is over 10–12 years old and the repair exceeds $1,000, replacement usually makes more financial sense — especially with today’s more efficient units lowering your monthly energy costs.
Repair makes sense when:
System is under 10 years old
Repair cost is under $800–1,000
No history of major recurring repairs
System is running efficiently otherwise
You plan to sell the home soon
Replacement makes sense when:
System is 12+ years old
Repair cost exceeds $1,000–1,500
Recurring repairs in recent seasons
High energy bills despite normal use
R-22 refrigerant system (discontinued)
Authorized Trane Dealer in St. Louis
As an authorized Trane dealer, we offer Trane air conditioners with full manufacturer warranty support, factory-certified installation, and access to the complete Trane product line. Trane systems are backed by some of the strongest warranties in the industry — and we stand behind every installation we do.
Preventive Care
AC Maintenance in St. Louis
Annual AC maintenance is the single best investment you can make in your cooling system. Without regular service, dirt builds up on coils, refrigerant levels drop unnoticed, and electrical connections degrade — all of which lead to breakdowns at the worst possible time and a shorter system lifespan.
A standard tune-up from Thomas Hoffmann Air Conditioning & Heating includes a full system inspection, coil cleaning, refrigerant check, electrical connection tightening, thermostat calibration, and a filter inspection. We’ll flag anything that needs attention — and we won’t recommend a repair you don’t need.
24/7 Service Call Now
At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves on being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and maintain your business or home’s HVAC system.
Common Questions
AC Questions — Answered Honestly
How quickly can you respond to an AC emergency?
We answer emergency calls 24/7, including weekends and holidays. Call (314) 471-7625 and you’ll reach us directly — not an answering service. We dispatch as quickly as possible, typically the same day for emergencies.
Why is my AC running but not cooling?
The most common causes are low refrigerant, a dirty evaporator coil, a failing compressor, or restricted airflow from a clogged filter or blocked duct. Some are simple fixes; others need a technician. If your AC is running but your home isn’t cooling, call us — we’ll diagnose it accurately on the first visit.
Do you service all AC brands?
Yes. We repair and maintain all major brands — Trane, Carrier, Lennox, American Standard, Rheem, Goodman, York, Amana, and more. As an authorized Trane dealer, we also offer new Trane installations with full manufacturer warranty support.
How long does an AC installation take?
Most residential AC installations are completed in a single day. We’ll give you a clear timeframe before we start, keep the job site clean, and make sure your system is running and properly calibrated before we leave. You won’t go without cooling overnight.
How do I know if I should repair or replace my AC?
We’ll give you a straight answer. A useful rule: if your system is over 10–12 years old and the repair costs more than $1,000, replacement usually makes more financial sense when you factor in efficiency gains and the cost of future repairs. We’ll show you the math — no pressure either way.
What areas do you serve?
We serve the greater St. Louis metro area including Chesterfield, Ballwin, Kirkwood, Webster Groves, Creve Coeur, Manchester, Maryland Heights, Des Peres, and surrounding communities.
What’s included in an AC tune-up?
Our standard AC tune-up includes coil cleaning, refrigerant level check, electrical connection inspection and tightening, thermostat calibration, filter inspection, condensate drain check, and a full system performance test. We’ll flag anything that needs attention and explain what we found.
Why choose Thomas Hoffmann over a national HVAC chain?
Many national brands operating in St. Louis are franchise operations — not true local companies. Thomas Hoffmann is locally owned, and Thomas himself remains directly involved in the business. You get 30+ years of St. Louis-specific experience, a Master Technician’s expertise, and an owner who cares about his reputation in this community.
AC Problems? We’re Available 24/7.
Call for emergency repair, a free estimate on a new system, or to schedule annual maintenance. St. Louis’s locally owned HVAC team — honest answers, no runaround.