Whole-house fans can help reduce your electric bills by providing ventilation and cool, fresh air. Use this whole house fan cost guide to price out the project.
How Much Does Furnace Repair Cost in St. Louis? [2025 Data]
Normal Range: $113 - $364
Furnace repair costs in St. Louis, MO, are $238 on average. The final cost depends on the furnace type, which part needs repair, and labor rates in your area, so the final price will range from $113 to $364. Reach out to a local HVAC pro for an accurate estimate.
How we get this data
Photo: Morsa Images / DigitalVision / Getty Images
Photo: Morsa Images / DigitalVision / Getty Images
Highlights
Changing an old, dirty filter is the simplest, least expensive repair.
Replacing a heat exchanger, coil, or circuit board will be the most expensive.
Schedule annual tuneups, which cost $125 to $200, to reduce long-term repair costs.
HVAC labor rates in St. Louis are $125 to $150 per hour.
Furnace repair costs in St. Louis are $238 on average, with most homeowners spending between $113 and $364, depending on material and labor costs. St. Louis winters regularly bring temperatures below 32 degrees Fahrenheit, so it’s important that homeowners here have a reliable furnace to keep out the cold. If your furnace isn’t doing so hot, it’s time to start budgeting for repairs.
Furnace Repair Cost Factors
The cost to repair a furnace in St. Louis, MO, depends on many different factors. What type of furnace do you have? Which part is malfunctioning? Do you need someone to fix it after normal business hours? Consider these common cost factors when budgeting for furnace repairs.
Repair Cost by Part
Regardless of their fuel source, furnaces are complex appliances that have a lot of working parts. Some of those parts significantly influence furnace repair costs, while others are simpler and less costly to repair.
Here is the average furnace repair cost based on the part:
| Furnace Part | Cost |
|---|---|
| Filter | $1–$35 |
| Flame sensor | $60–$238 |
| Transformer | $113–$400 |
| Thermostat | $113–$600 |
| Combustion chamber | $113–$800 |
| Heat exchanger | $113–$3,000 |
| Relay switch | $150–$400 |
| Ignitor | $150–$500 |
| Burner | $150–$500 |
| Blower motor | $150–$1,500 |
| Gas valve | $273–$600 |
| Circuit board | $273–$2,000 |
| Draft inducer motor | $273–$1,500 |
| Flue pipe | $364–$800 |
| Coils | $750–$2,000 |
Maintenance Cost
A furnace requires regular maintenance in order to operate efficiently. Otherwise, dust and other debris can clog burners, the pilot light, and other parts, causing more wear and tear on the system.
A furnace inspection costs $80 to $100 on average, and you need to schedule an inspection at least once per year to keep your system running smoothly. An advanced inspection, which includes cleaning and a tuneup, costs $125 to $200.
Additional maintenance costs include filters and air duct cleanings. You need to replace the filters once every 90 days, which will cost $4 to $140 per year. Schedule duct cleanings every three to five years, and expect to spend $275 to $500 for the cost of cleaning air ducts.
HVAC Pro Costs
In St. Louis, HVAC labor costs $125 to $150 per hour, or $150 to $215 per hour for emergency or after-hours repairs. You can replace old furnace filters yourself, but leave any larger repairs to a pro. Otherwise, you risk voiding your warranty with DIY work. Also, DIYing without training and certification can lead to costly mistakes and increase the risk of fires or gas leaks. Call an HVAC pro in St. Louis, MO, to fix up your furnace fast.
Angi Tip
HVACs are one of the most complicated and essential systems in our homes. To avoid further damage or safety risks, always hire a certified HVAC specialist to repair or replace broken parts.
Do Furnace Repairs Increase Home Value?
Furnace repairs don’t have a huge impact on your home’s value, but buyers do expect furnaces to be in good, working condition. You can help your home stand out to buyers by keeping up with maintenance and repairs or replacing the system entirely if it’s over 15 years old. A total furnace replacement can increase the value of your home by 5% to 7%.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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