Air Conditioning · Festus, MO & Jefferson County
Air Conditioning Repair, Installation & Maintenance, done by the Exact Method
Exactly what's wrong. Exactly what it costs. In writing.
ExactAir diagnoses the exact problem, shows you the exact findings, and prices the exact fix — before any repair, replacement, or new system goes in. That’s not a slogan. It’s the checklist your technician actually works from, every visit.
Veteran-Owned · Family-Owned · EPA Certified · Fully Insured · Est. 2025
How do you know your AC needs attention?
Missouri summers swing from humid and still to sudden storms, often in the same afternoon, and a struggling air conditioner won’t forgive that swing. Call before one of these turns into a no-cool emergency:
- Warm or weak airflow from the vents
- Your cooling bill has crept up with no change in habits
- Rooms cool unevenly, or the air feels humid even while running
- The system short-cycles, turning on and off in quick bursts
- Grinding, clicking, or rattling from the outdoor unit
- The system is 12+ years old with no recent inspection
Air Conditioning Services in Festus & Jefferson County
Every job below starts the same way: an exact diagnosis before a wrench ever comes out. Pick the one closest to what’s going on, or call and describe it — ExactAir will point you to the right one.
AC Installation
New construction and full-system installs sized to your home, not to what's on the truck. Every install is tested against manufacturer spec before we call it finished.
AC Repair
We measure before we diagnose — refrigerant charge, static pressure, and airflow — so a repair fixes the actual cause, not just the symptom you called about.
AC Replacement
If a dependable repair still makes sense, we'll say so. If replacement is the honest answer, you'll see real options and real pricing before you decide anything.
AC Maintenance
Seasonal tune-ups that catch a failing capacitor or a dirty coil before it becomes a July no-cool call. Missouri summers don't leave much room for surprises.
Ductless Mini-Split
Install and service for ductless mini-split systems — a clean fit for additions, garages, and homes without existing ductwork.
Commercial & Light Commercial
Light commercial cooling — offices, small retail, shop spaces — gets the same documented process as a home visit: exact findings, exact pricing, and equipment tested to spec before the ticket closes.
The ExactAir Method: what every AC job includes
We pinpoint the true condition of your AC system, complete the work to standard, and prove the results before we call the job done.
Exact Diagnosis
The technician identifies what's actually wrong with your AC system before recommending anything at all.
Exact Findings
You see the real readings and observations behind the diagnosis — not a guess dressed up as an answer.
Exact Options
You're shown the realistic paths forward, repair or replace, side by side, with no pressure toward either one.
Exact Pricing
The cost is set and shown to you before any work begins — not estimated after the fact and adjusted later.
Exact Testing
Refrigerant charge, static pressure, and airflow are checked against manufacturer spec, not eyeballed.
Exact Verification
The system is confirmed working to standard before the technician calls the job finished — every time.
Why Jefferson County homeowners choose ExactAir
An exact diagnosis in writing
You see what we checked, what we found, and what it will cost before making a decision.
Real measurements, not guesswork
Actual equipment readings and a thorough checklist to size your new system correctly.
No unnecessary replacement pressure
If a dependable repair makes sense, we'll show you — instead of automatically pushing a new system.
Work completed to the proper standard
Repairs and installations follow manufacturer requirements and are tested before we call the job finished.
Local, owner-level accountability
Clear communication, respect for your home, and work from someone personally responsible for the result.
Where "Exact" comes from
ExactAir Heating and Cooling was founded in 2025 by Brett Lahue — an Army veteran who learned the trade the old way, checked off job by job under his father, a by-the-book technician himself.
When a job was done right, the answer was always the same word: “Exactly.” The name, and the standard behind it, stuck.
Today ExactAir is a small, owner-operated company serving Festus and Jefferson County — background-checked, EPA certified for both Universal and A2L refrigerants, and insured through Federated Insurance.
— Brett Lahue, Owner & Lead Technician
Based in Festus, ExactAir sends a truck up to about 45 minutes out
Covering Jefferson County and the edge of the St. Louis metro. Don’t see your town? Call us — a trip fee may apply outside our primary service area, and we’re glad to tell you upfront if you’re too far out.
What Jefferson County homeowners say about their AC
Common questions
Air Conditioning Questions, Answered Plainly
How much does AC repair cost in Festus, MO?
It depends on what’s actually wrong, which is exactly why ExactAir doesn’t quote AC repair prices over the phone. A technician checks real readings first — refrigerant charge, static pressure, electrical draw — then shows you the exact price before any repair starts. No guessing, no surprise invoice.
Should I repair or replace my air conditioner?
It depends on the age of the system, the cost of the repair, and how it’s been maintained. ExactAir shows both the repair option and the replacement option side by side, with real pricing on each, so you decide — there’s no automatic push toward a new system if a dependable repair still makes sense.
How often should I have my AC serviced in Missouri?
Once a year, ideally in spring before the first stretch of hot, humid weather. Jefferson County summers swing between mild and brutal fast, and a system that’s already borderline won’t handle that swing well without a tune-up first.
Do you offer emergency AC repair?
Yes — ExactAir offers 24/7 emergency service. Call or text (314) 893-4707 any time. Brett personally answers and will get out to you whether or not it’s during regular business hours.
What areas does ExactAir serve for AC installation and repair?
ExactAir is based in Festus and serves Jefferson County and the surrounding St. Louis Metro area, generally within about 45 minutes of Festus — including Herculaneum, Crystal City, Pevely, Imperial, Arnold, Hillsboro, Cedar Hill, and House Springs. A trip fee applies past the standard service radius, and service inside St. Louis city and St. Louis County is currently limited pending additional licensing there.
Do you install ductless mini-split systems?
Yes. Ductless mini-splits are a good fit for additions, garages, older homes without existing ductwork, or a single room that never cools evenly. ExactAir installs and services both single-zone and multi-zone mini-split systems.
Same standard, every visit — exact diagnosis before any work begins.
Monday–Friday, 7am–7pm · 24/7 emergency service available
