St. Louis Air Conditioning · 24/7 Emergency Service
AC Repair, Replacement & Installation — St. Louis, MO.
Locally owned. Master HVAC Engineer Thomas Hoffmann leads a team backed by 30+ years of St. Louis cooling experience. AC repair, full system replacement, and seasonal maintenance — handled by people who actually know the equipment.
24/7 Phone
Real people answer every call
Master Engineer
Tom Hoffmann leads every job
Trane Dealer
Authorized, factory-trained
Locally Owned
Based in Des Peres, MO
24/7 Emergency Service
AC Repair in St. Louis
When your air conditioner stops working in the middle of a St. Louis summer, you need a fast, accurate diagnosis — not a guessing game. We dispatch 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.
AC Not Cooling
Running but blowing warm air — often refrigerant, compressor, or airflow
AC Won’t Turn On
Tripped breaker, failed capacitor, thermostat, or electrical fault
Frozen Coil
Restricted airflow or low refrigerant — 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
Short Cycling
Turns on/off rapidly — often refrigerant, electrical, or sizing issue
Repair vs. Replace
Should You Repair or Replace Your AC?
A straight answer based on your system’s age, repair cost, and efficiency. 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 monthly energy costs.
Repair makes sense when:
• System is under 10 years old
• Repair cost is under $800–1,000
• No history of recurring repairs
• System 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
Trane AC Systems 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.
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 us 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.
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?
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.