Festus, MO · Jefferson County
Furnace Repair That Finds the Cause, Not Just the Symptom
Exactly what's wrong. Exactly what it costs. In writing.
A furnace that stops heating can have more than one possible cause. ExactAir checks how the furnace starts, runs, moves air, and responds to its controls before recommending a repair.
Veteran-Owned · Family-Owned · EPA Certified · Fully Insured · Est. 2025
Signs You Need Furnace Repair
How do you know your furnace needs service?
Some furnace problems are obvious, while others start as small changes in comfort or operation. Getting the system checked when something changes can help identify the problem before you are left without heat.
- Furnace won’t start — The system does not respond when you call for heat.
- Cold or weak airflow — The furnace runs but the air coming from the vents is not properly warm.
- Frequent cycling — The furnace starts and stops more often than it normally should.
- Uneven heating — Some rooms remain cold while others reach the desired temperature.
- Unusual furnace noises — New banging, rattling, buzzing, or grinding sounds should be investigated.
- Long heating cycles — The furnace runs for extended periods without adequately heating the home.
- Higher heating bills — A sudden increase in operating costs can point to a change in system performance.
- Burning or unusual odors — A persistent unfamiliar smell during operation should not be ignored.
What Happens During a Furnace Repair Visit
We check the furnace before deciding what needs to be repaired.
A furnace repair should start with diagnosis, not parts replacement. ExactAir evaluates the equipment while it is operating to identify the condition actually causing the problem.
Exact Furnace Diagnosis
We review the reported symptoms and check how the furnace is starting, operating, and responding to its controls.
Exact Performance Testing
Relevant electrical, temperature, airflow, and operating conditions are checked based on the furnace and the problem being reported.
Exact Problem Identification
We narrow the issue down to the component, condition, or system problem affecting furnace operation.
Exact Findings
We explain what was found and why it is affecting your heating system.
Exact Repair Pricing
You receive the repair recommendation and price before any approved repair work begins.
Exact Repair Verification
After the repair, we run the furnace again and verify that it is operating properly before the visit is complete.
Why Jefferson County Homeowners Choose ExactAir for Furnace Repair
Diagnosis before parts
We look for the actual cause of the furnace problem instead of guessing at the first component to replace.
Furnace-specific testing
The equipment is evaluated while operating so repair decisions are based on actual system behavior.
Clear repair options
You get a straightforward explanation of the problem and the recommended repair before work begins.
No automatic replacement pitch
An older furnace is not automatically treated as a replacement job. We explain what the system needs and let you decide how to proceed.
Owner-level accountability
ExactAir is veteran-owned and family-owned, with a focus on clear communication and properly completed HVAC repairs.
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
Furnace Repair in Festus & Jefferson County, MO
ExactAir is based in Festus and provides furnace repair throughout Jefferson County and the surrounding St. Louis Metro area, generally within about 45 minutes of Festus. Whether your furnace will not start, is not heating properly, cycles too often, or is making unusual noises, we can diagnose the problem and explain the repair options.
Note: 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.
What Customers Say About ExactAir's Furnace Service
Frequently Asked Questions
Furnace Repair FAQs
How much does furnace repair cost in Festus, MO?
The cost depends on the cause of the problem, the equipment, and the repair required. ExactAir diagnoses the furnace first and provides the repair price before work begins.
Why is my furnace running but not heating my house?
Several conditions can cause this, including airflow problems, control issues, component problems, or reduced system performance. The furnace needs to be tested to identify the actual cause.
Why does my furnace keep turning on and off?
Frequent cycling can have several causes, including airflow or control problems and other operating conditions. ExactAir checks the system to determine why it is cycling.
Should I repair or replace my furnace?
That depends on the furnace’s condition, repair needs, age, and overall performance. ExactAir can explain the repair and help you understand the condition of the existing system.
Can you repair an older furnace?
Yes, when the equipment and repair are serviceable. ExactAir evaluates the furnace and explains the available repair options based on its condition.
Do you offer emergency furnace repair?
Yes. ExactAir offers 24/7 emergency service for heating problems that cannot reasonably wait for normal business hours.
Don't guess what's wrong with your furnace. Get the problem diagnosed first.
Monday–Friday, 7am–7pm · 24/7 emergency service available
