What HVAC work costs in St. Louis and why estimates differ
Read the ranges as a starting point
The figures below are typical ranges taken from the service pages on Defendingloaded Heating & Air. They are not quotes. Your price depends on your equipment, your house and the provider you hire. Defendingloaded Heating & Air does not set prices. Independent providers do.
Use the ranges to spot an estimate that looks far off. Do not use them to predict your exact total.
AC repair ranges
- Diagnostic visit: $75 – $200. Often separate from the repair cost.
- Capacitor replacement: $120 – $450. Common after hot spells.
- Contactor replacement: $150 – $400. A small electrical part.
- Condensate drain clearing: $100 – $350. Prevents leaks and shutoffs.
- Fan motor replacement: $300 – $800. Indoor or outdoor fan.
- Refrigerant leak repair and recharge: $200 – $1,500+. Depends on leak location.
Hot, humid summers in the St. Louis area keep air conditioners running for long stretches. That is why electrical parts and drains show up so often. If your air handler sits in a basement, a clogged drain can spill onto the floor. Do not ignore a wet pan.
Furnace repair ranges
- Diagnostic visit: $75 – $200. Often applied to the repair, but ask first.
- Igniter or flame sensor: $100 – $350. Common cause of no-heat problems.
- Thermostat replacement: $100 – $400. Smart models cost more.
- Blower motor repair: $300 – $900. Varies by motor type.
- Draft inducer motor: $300 – $800. Needed for safe venting.
- Control board: $300 – $850. Depends on make and model.
Do not skip a venting part to save money. The draft inducer exists to move exhaust out of the house. If a provider suggests running the furnace without it, decline.
Replacement and installation ranges
- Central AC replacement: $5,000 – $12,000. Depends on size, brand and efficiency rating.
- Heat pump system: $6,000 – $14,000. Cools and heats; cold climates may need extras.
- Ductless mini-split (one zone): $3,000 – $7,000. Good for homes with no ducts.
- Ductwork repair or changes: $500 – $3,500. Older homes often need sealing or resizing.
- Electrical and permit work: $200 – $1,500. Varies by local rules and panel condition.
- New thermostat: $150 – $600. Smart models cost more to install.
Winters with deep frost matter for heat pumps. Ask any provider how the system will keep heating in the coldest weeks, and whether a backup heat source is part of the estimate.
What pushes a bill up
- Equipment size and efficiency rating. Larger or higher-efficiency units cost more to buy and install.
- Hard-to-reach equipment. Tight attics, crowded basements and cramped utility closets add labor.
- Duct condition. Leaky or undersized ducts in older homes may need work before new equipment can perform.
- Electrical and permit needs. An older panel or a local permit rule can add a line to the estimate.
- Parts for older models. Hard-to-find parts take longer to source.
- Where a refrigerant leak is. A leak in an easy-to-reach spot costs far less to fix than one inside a coil.
- Peak weather. During a heat wave or a hard cold snap, fewer providers may be open to new requests.
What can bring it down
- Routine maintenance. Clean filters and clear drains prevent many of the small failures listed above.
- Written estimates from more than one provider. Compare what is included.
- Asking about the diagnostic fee. Find out whether it is applied to the repair.
- Asking for repair and replacement options side by side. Then you can compare cost against the age of the unit.
- Planning ahead. Replacing a failing system in a mild season gives you time to compare, instead of deciding in a hurry.
Do and do not
Do ask for an itemized estimate that separates parts, labor, permits and fees.
Do ask what is not included.
Do not accept a refrigerant recharge with no leak search.
Do not pay in full before work starts.
Do not assume your insurance will cover a repair. Ask your insurer.
Defendingloaded Heating & Air is a referral site, and independent providers set their own prices. The request form routes your details to providers who serve your part of the St. Louis area. Availability depends on each provider.
Related guides
What HVAC work costs in St. Louis and why estimates differ: questions
Why is the diagnostic visit priced separately?
The visit pays for a provider's time and travel to find the cause, before any repair is chosen. Some providers apply that fee to the repair if you go ahead, and some do not. Ask before the visit, and look for the answer on the written estimate.
How do I know if a quote is out of line?
Compare it with the ranges in this guide and with at least one other written estimate. A figure far above or below the range is worth a question. Ask what is included, which parts are used, and whether permits and disposal are covered.
Does the estimate cover problems found later?
Not always. Ask what happens if another issue turns up once the equipment is opened. A careful provider tells you first, explains the extra work and its cost, and waits for your approval. Do not agree to open-ended work with no limit.
Get in touch
Have an AC or furnace problem? Send a request or call, and we will route you to an independent provider in our network. No obligation.
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