Furnace Repair & Heating Services in St. Louis, MO
Expert furnace repair, installation, and heating maintenance from a locally owned St. Louis HVAC company — honest answers, no upsell.
We keep St. Louis homes warm through the coldest winters. From a furnace that won't fire to a full new installation, Thomas Hoffmann Air Conditioning & Heating is available 24/7 — including heating 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 furnace 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 type, and every level of urgency — including 24/7 emergency heating 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
Furnace Repair in St. Louis, MO
When your furnace stops working in the middle of a St. Louis winter, you can't wait. 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 Furnace Problems We Diagnose & Fix
Furnace not heating
Running but blowing cold air — often ignition, heat exchanger, or fuel supply issue
Furnace won't turn on
Tripped breaker, failed igniter, thermostat issue, or gas supply problem
Short cycling
Furnace turns on and off repeatedly — often a dirty filter, faulty flame sensor, or heat exchanger issue
Cracked heat exchanger
A safety hazard — can allow carbon monoxide into your home. Requires immediate inspection
Unusual noises or smells
Banging, rattling, or burning smells — blower motor, ignition, or duct problems
Pilot light or ignition failure
System won't stay lit or ignition won't fire — thermocouple, gas valve, or igniter replacement
We Service All Major Furnace & Heating Brands
As an authorized Trane dealer, we have deep expertise in Trane heating systems — but we repair and maintain every major brand including Carrier, Lennox, American Standard, York, Amana, Goodman, Rheem, and more. If it heats your home, we can fix it.
Authorized Trane Dealer
Furnace Installation & Replacement in St. Louis
Whether your furnace has reached the end of its life or you're upgrading to a more efficient system, Thomas Hoffmann Air Conditioning & Heating helps you find the right unit at the right price. With over 30 years of furnace installations across the St. Louis metro, we know what performs in our climate — and what lasts.
Most residential furnace installations are completed in a single day. We give you a clear timeframe before we start, keep the work area clean, and make sure your system is running and calibrated before we leave.
Should You Repair or Replace Your Furnace?
We'll give you a straight answer based on your system's age, the repair cost, and its efficiency. A general guideline: if your furnace is over 15 years old and a repair exceeds $800–1,000, replacement usually makes more financial sense — today's high-efficiency units can significantly reduce your monthly gas bill.
Repair makes sense when:
Furnace is under 15 years old
Repair cost is under $800
No history of recurring repairs
System is running efficiently otherwise
Heat exchanger is intact
Replacement makes sense when:
Furnace is 15–20+ years old
Repair cost exceeds $1,000
Recurring repairs in recent seasons
High gas bills despite normal use
Cracked or suspect heat exchanger
Authorized Trane Dealer in St. Louis
As an authorized Trane dealer, we offer Trane furnaces with full manufacturer warranty support and factory-certified installation. Trane heating systems are among the most reliable and efficient in the industry — and we stand behind every installation we do.
Heating & Cooling in One System
Heat Pump Repair & Installation in St. Louis
Heat pumps provide efficient heating and cooling from a single system — transferring heat rather than generating it, which can significantly reduce energy costs compared to a traditional furnace and AC combination. We repair, maintain, and install heat pumps for St. Louis homeowners looking for a more energy-efficient alternative.
Not sure if a heat pump is the right fit for your home? We'll assess your situation honestly — including whether St. Louis winters are cold enough to affect performance — and help you make an informed decision. We service all major heat pump brands and offer Trane heat pump installations with full warranty support.
Radiant Heating
Boiler Service & Repair in St. Louis
Thomas Hoffmann Air Conditioning & Heating services and repairs boiler systems for St. Louis homes. Boilers provide reliable radiant heat — quieter and often more even than forced-air systems — but they require specialized expertise when problems arise. Our technicians have the hands-on experience to diagnose and repair all common boiler issues, including pressure problems, circulation failures, pilot issues, and zone control malfunctions. Call (314) 471-7625 to schedule boiler service.
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
Heating Questions — Answered Honestly
How quickly can you respond to a heating 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 and treat heating failures as the emergencies they are in winter.
Why is my furnace blowing cold air?
The most common causes are a failed igniter, a dirty flame sensor, a tripped limit switch, or a gas supply issue. Some are straightforward fixes — others point to a more serious problem like a cracked heat exchanger. Call us and we'll diagnose it accurately on the first visit.
Do you service all furnace 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 furnace installations with full manufacturer warranty support.
How long does a furnace installation take?
Most residential furnace installations are completed in a single day. We'll give you a clear timeframe before we start, keep the work area clean, and make sure your system is running and calibrated before we leave. You won't spend a night without heat.
Should I repair or replace my furnace?
We'll give you a straight answer. A useful rule: if your furnace is over 15 years old and the repair costs more than $800–1,000, replacement usually makes more financial sense — especially when today's high-efficiency units can noticeably reduce your monthly gas bill. We'll show you the numbers, 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 a furnace tune-up?
Our standard furnace tune-up includes a heat exchanger inspection, burner cleaning, igniter and flame sensor check, flue and venting inspection, filter check, thermostat calibration, electrical connection tightening, and a full system performance test. We'll flag anything that needs attention before it becomes a breakdown.
Is a heat pump better than a furnace for St. Louis winters?
It depends. Heat pumps are highly efficient in moderate cold but can struggle in extended sub-freezing temperatures without a backup system. For St. Louis winters, a dual-fuel system — heat pump paired with a gas furnace backup — often gives you the best of both. We'll help you evaluate the right option for your home and budget.
Furnace Problems? We're Available 24/7.
Call for emergency repair, a free estimate on a new furnace, or to schedule annual maintenance. St. Louis's locally owned heating team — honest answers, no runaround.