Heating · Festus, MO & the St. Louis Metro
Furnace & Heating Repair, Installation, and Maintenance, done by the Exact Method
Exactly what's wrong. Exactly what it costs. In writing.
Whether it’s a furnace that won’t fire on the coldest morning of the year or a system that’s overdue for a fall tune-up, ExactAir diagnoses the exact problem, shows the exact findings, and prices the exact fix — before any work begins.
Veteran-Owned · Family-Owned · EPA Certified · Fully Insured · Est. 2025
How do you know your heating needs attention?
A furnace rarely fails without warning first. Call before one of these turns into a no-heat emergency on the coldest night of the year:
- Weak heat, or rooms that never quite reach temperature
- The system short-cycles, turning on and off in quick bursts
- Banging, clicking, or squealing when the system starts
- A burning or odd smell that doesn’t clear after a few minutes
- Your heating bill has crept up with no change in habits
- The furnace is 15+ years old with no recent inspection
A note on safety
A yellow or flickering burner flame (instead of steady blue), soot near the furnace, or a triggered carbon monoxide detector are not “wait and see” issues. Shut the system off, ventilate the area, and call (314) 893-4707 right away — this falls under 24/7 emergency service.
Heating services in Festus & Jefferson County
Every job starts the same way: an exact diagnosis before a wrench comes out. Below covers furnace-based heating — if your home runs on a heat pump, see the heat pumps page instead.
Heating Installation
New heating equipment sized to your home, not sold off a price list. Airflow and combustion are verified at commissioning so the system performs the way it's rated to from day one.
Heating Repair
Real diagnostics — burner operation, ignition, airflow, electrical draw — find the actual cause. You see the exact findings and the exact price before any repair begins.
Heating Replacement
When a repair no longer makes sense, you're shown the repair option and the replacement option side by side, with real pricing on both — no automatic push toward the bigger invoice.
Heating Maintenance
A fall tune-up catches a cracked heat exchanger, a failing igniter, or a dirty burner before it becomes a no-heat call in the middle of winter.
Furnace Services
Installation, repair, replacement, and maintenance for electric, oil, and propane furnaces — whichever fuel type your home runs on.
Space & Unit Heaters
Installation and repair for garages, workshops, and additions that need dedicated heat outside the main system.
Whatever your furnace runs on
Jefferson County homes run on a mix of fuel types, and ExactAir services all three:
Electric Furnaces
Common in newer or all-electric homes. Repairs typically center on heating elements, sequencers, and airflow rather than combustion.
Oil Furnaces
Still common in older Jefferson County housing stock. Nozzle, burner, and ignition issues are diagnosed with real combustion readings, not guesswork.
Propane Furnaces
A frequent choice outside natural gas lines. Gas pressure, ignition, and venting are checked and verified as part of every service call.
The ExactAir Method: what every heating job includes
Every heating visit — repair, install, or maintenance — runs through the same six steps, in order.
Exact Diagnosis
The technician identifies what's actually wrong with your heating system before recommending anything.
Exact Findings
You see the real readings behind the diagnosis — burner operation, airflow, electrical draw — not a guess.
Exact Options
You're shown the realistic paths forward, repair or replace, side by side, with no pressure toward either.
Exact Pricing
The cost is set and shown to you before any work begins — not estimated after the fact.
Exact Testing
Combustion, airflow, and safety controls are checked against manufacturer spec, not eyeballed.
Exact Verification
The system is confirmed working to standard, safely, before the technician calls the job finished.
Why Jefferson County homeowners choose ExactAir
An exact diagnosis in writing
You see what was checked, what was found, and what it costs before any decision gets made.
Real measurements, not guesswork
Actual equipment readings and a documented checklist drive every recommendation, not instinct.
No pressure toward replacement
If a dependable repair makes sense, that's what gets shown to you — not automatically the new system.
Work completed to the proper standard
Repairs and installs follow manufacturer requirements and get tested before the job is called finished.
Owner-level accountability
Brett Lahue is personally responsible for the result on every job ExactAir takes on.
Rated 5 stars by local homeowners
ExactAir’s reviews so far come from air conditioning and installation jobs — read them in full, along with the story behind the ExactAir name, on the About page.
Serving businesses in Festus & Jefferson County, MO
ExactAir is based in Festus and works throughout Jefferson County and the surrounding St. Louis Metro area, generally within about 45 minutes of Festus.
Good to know before you call
A trip fee applies past the standard service radius. Service inside St. Louis city and St. Louis County is currently limited, pending additional licensing there.
Heating FAQs
How much does furnace repair cost in Festus, MO?
It depends on what’s actually wrong, which is why ExactAir doesn’t quote furnace repair prices over the phone. A technician checks real readings — burner operation, airflow, electrical draw — then shows you the exact price before any repair starts.
How old is too old for a furnace?
Most furnaces last 15 to 20 years, but age alone doesn’t decide it. ExactAir shows the repair option and the replacement option side by side, with real pricing on each, so you can weigh a furnace’s age against the actual cost of fixing it.
How often should a furnace be serviced?
Once a year, ideally in fall before the first cold stretch. A yearly tune-up catches a cracked heat exchanger, a failing igniter, or a dirty burner before it turns into a no-heat call in January.
Do you offer emergency heating repair?
Yes — ExactAir offers 24/7 emergency service. Call or text (314) 893-4707 any time. A no-heat call in freezing weather doesn’t wait for business hours, and neither do we.
Do you work on oil and propane furnaces, or just electric?
All three. ExactAir installs, repairs, replaces, and maintains electric, oil, and propane furnaces, along with space and unit heaters for garages, workshops, and additions.
Do you install or service boilers?
No. Boilers, wall-hung boilers, and tankless water heaters are a hydronic and plumbing specialty that ExactAir doesn’t currently offer.
Should I get a furnace or a heat pump?
It depends on your home and how you use it — both are common in this area. ExactAir installs and services both; see our Heat Pumps page for how the two compare.
Same standard, every visit — exact diagnosis before any work begins.
Monday–Friday, 7am–7pm · 24/7 emergency service available
