Festus, MO · Jefferson County
Heating & Cooling in Festus, MO — Straight Answers Before Anyone Sells You Anything
Exactly what's wrong. Exactly what it costs. In writing.
ExactAir provides residential & commercial heating & cooling service, maintenance, and replacement across Jefferson County and the surrounding St. Louis metro. Every job runs on the ExactAir Method — a documented process that shows what we checked, what we found, and what it costs before any work begins.
Veteran-Owned
Family Operated
EPA Universal & A2L
Certified Technician
24/7
Emergency Service
The Document, Not the Pitch
This is what you actually get — not a sales script.
ExactAir is a new company, built on an old-school standard: nothing gets called “done” until it’s checked against this exact list. It’s the same checklist every technician works from, on every job, in every home.
01 · Diagnosis
What's actually wrong, confirmed before anything else
02 · Findings
Real measurements, written down
03 · Options
What each path costs and accomplishes
04 · Pricing
The number, in writing, before work starts
05 · Testing
Verified against manufacturer standard
06 · Verification
Confirmed working before we call it finished
Home of the ExactAir Method™
Uncertainty in. Verified certainty out.
The ExactAir Method turns guesswork into documentation by controlling how every job is assessed, communicated, performed, verified, and recorded.
STEP 01
Exact Diagnosis
We confirm what's actually wrong before recommending anything — not a first guess treated as a final answer.
STEP 02
Exact Findings
Real equipment readings and a full checklist, not a verbal impression you have to take on faith.
STEP 03
Exact Options
If a dependable repair makes sense, you'll see that option — not just a push toward replacement.
STEP 04
Exact Pricing
The cost, in writing, before any work begins. No surprises once the job is underway.
STEP 05
Exact Testing
Repairs and installs are completed to manufacturer standard, not just "good enough."
STEP 06
Exact Verification
Nothing is called finished until it's tested and confirmed working as intended.
What We Do
Residential Heating & Cooling
Air Conditioning
Installation, repair, replacement, maintenance & ductless mini-splits.
Heating
Furnace repair & installation — gas, electric, propane, and oil systems.
Heat Pumps
Cold-climate & dual-fuel systems, mini-splits, install through maintenance.
Residential & Light Commercial
Homes, small businesses, and light commercial properties across Jefferson County.
Indoor Air Quality
Humidity control, filtration, UV purification, and duct sealing for Festus's mixed housing stock.
Maintenance Plans
Scheduled seasonal service to catch problems before they become emergencies.
The ExactAir Refusals
What we won't do — on purpose.
Most heating & cooling companies list what they offer. Here’s what we deliberately don’t.
No high-pressure closes
No "today-only" pricing, no closer standing over your shoulder waiting for a signature.
No size-guessing
Equipment gets sized to your home's real numbers — not a rule-of-thumb estimate.
No cheapest-bid work
If the lowest price is all that matters, we're probably not the right fit — and that's fine.
Why ExactAir
Five reasons homeowners choose us
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 find the real cause of the problem.
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.
Built On Standards, Not Volume
Where we stand today
ExactAir is a new company — here’s exactly where things stand, no exaggeration.
Veteran-Owned
Family owned and operated by Brett Lahue, U.S. Army veteran.
EPA Certified
EPA Universal and A2L certified technician on every job.
Insured
Commercial vehicle, general liability, and workers' comp coverage.
Background-Checked
Background-checked and drug-tested — every technician, every time.
Missouri heating & cooling licensing is currently in progress. We’d rather tell you that plainly than let you assume — the same standard applies to the paperwork as to the equipment.
Early Reviews, Real Words
What Jefferson County homeowners say
Meet the Owner
Where "Exactly!" became ExactAir
Brett Lahue learned the trade the old-school way — working under his father, a by-the-book journeyman who’d check every task before signing off. When something was right, he’d say “Exactly!” That word stuck. After the Army and years in the field, Brett built ExactAir around the same standard: documented, tested, and exact — every time.
The company name itself reflects the standard — exact, by-the-book work backed by real measurements, documented findings, and a process that can be explained.
It’s local, owner-level accountability from diagnosis through completion.
See exactly what's wrong before anyone tries to sell you what's next.
Call, text, or request service online. Brett personally handles every job.
Service Areas
Festus & Jefferson County, MO
Based in Festus, traveling roughly 45 minutes across Jefferson County and the St. Louis metro area.