Festus, MO · Jefferson County

Heating Replacement That Starts With the Right System for Your Home

Exactly what's wrong. Exactly what it costs. In writing.

Replacing a heating system is more than taking out the old equipment and putting a new one in its place. ExactAir evaluates your home’s heating needs, existing equipment, airflow, ductwork, installation conditions, and available system options before recommending a replacement.

Veteran-Owned · Family-Owned · EPA Certified · Fully Insured · Est. 2025

Signs You Need Heating Replacement

How do you know when it's time to replace your heating system?

A heating system does not have to completely fail before replacement becomes worth considering. Frequent repairs, declining performance, uneven comfort, and an aging system can all be reasons to evaluate whether continued repairs still make sense.

Your heating system needs frequent repairs — Repeated service calls can add up quickly and may signal that the system is reaching the end of its useful service life.
Heating performance keeps declining — If the system runs but struggles to maintain comfortable temperatures, replacement may be worth evaluating.
Repair costs are becoming harder to justify — A major repair on an older system can change the overall value of keeping the existing equipment.
The system struggles to heat certain rooms — Persistent temperature differences can indicate that the current system is no longer meeting the home’s heating needs.
Your heating bills have increased — Rising operating costs can be one sign that an older system is no longer performing as efficiently as it once did.
The system runs for long periods — Extended run times without reaching the desired temperature may indicate reduced heating capacity or another system issue.
The equipment is approaching the end of its service life — Older equipment may warrant a replacement evaluation before an unexpected failure leaves you without heat.
You’re planning a home improvement or remodel — Changes to the home’s layout or conditioned space may create a good reason to reassess the existing heating system.

What Happens During a Heating Replacement Visit

We evaluate the existing system before recommending what replaces it

A replacement should fit the home, not simply match the size or type of the equipment being removed. ExactAir looks at the complete heating setup before recommending a new system.

Exact Home Evaluation

We look at the home's heating requirements, existing equipment, comfort concerns, and the conditions affecting the current system.

Exact Sizing Review

We determine what heating capacity is appropriate for the home rather than automatically selecting equipment based on the old system's size.

Exact System Assessment

Existing ductwork, airflow, equipment connections, electrical requirements, and installation conditions are considered before the replacement is planned.

Exact Replacement Options

We explain the equipment options that make sense for the home, along with the differences that matter for comfort, operation, and installation.

Exact Installation

The old equipment is removed and the replacement system is installed according to the equipment requirements and the conditions of the home.

Exact Startup & Verification

The new system is started, tested, and checked for proper operation so you know the replacement was completed correctly before the job is finished.

Why Jefferson County Homeowners Choose ExactAir for Heating Replacement

Replacement based on the home

We consider the actual heating needs of the house instead of simply replacing old equipment with the same size.

The existing system gets evaluated first

Ductwork, airflow, electrical requirements, and installation conditions can all affect how a replacement performs.

Clear options without unnecessary pressure

You get an explanation of the available replacement options and what each one means for your home.

Installation is part of the performance

Proper sizing and installation matter just as much as the equipment itself, so the new system is tested after installation.

Owner-level accountability

ExactAir is veteran-owned and family-owned, with a straightforward approach from the initial evaluation through final system verification.

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

Heating Replacement in Festus & Jefferson County, MO

ExactAir is based in Festus and provides heating replacement throughout Jefferson County and the surrounding St. Louis Metro area, generally within about 45 minutes of Festus. If your existing system is aging, unreliable, inefficient, or no longer keeping your home comfortable, we can evaluate the system and help you understand your replacement 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 Heating Service

    
 
 
         
   KEITH CROWDEN 
 
 
 
 Trustindex verifies that the original source of the review is Google. Exactair did a great job installing my new Air Conditioner. Best price exceptional service I highly recommend Exact Air
  
 
        
   james blehm 
 
 
 
 Trustindex verifies that the original source of the review is Google. The technician  found what others couldn't.  He was timely and professional.  Pricing was easily affordable!  I will definitely be using them again for a new split system install. And would recommend to everyone!!
  
 
        
   Carole Kronmueller 
 
 
 
 Trustindex verifies that the original source of the review is Google. Exact AIR Is a wonderful HVAC business They are very efficient , reliable , affordable, and the best part is Brett Will give you personalized attention and make it a point if you have an emergency or not , to make it out and get you up and running. I highly recommend them, and I have shared their contact with several of my family members and friends that have asked. One other  note, it is a veteran owned company🇺🇸🇺🇸🇺🇸🇺🇸
  
 
        
   Guadalupe Rios 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with ExactAir Heating and Cooling from start to finish. Mr. Lahue  was  very knowledgeable, efficient, and made sure everything was working properly before leaving. The pricing was fair, and I appreciated the honest recommendations without any pressure to purchase unnecessary services. It's refreshing to work with a company that values quality and customer service. I would definitely recommend them to anyone looking for reliable AC repair or maintenance.  Promote Ahead of Peers.

Frequently Asked Questions

Heating Replacement FAQs

How much does heating replacement cost in Festus, MO?

The total cost depends on the equipment selected, the home’s requirements, installation conditions, and any work needed to properly connect and commission the new system. ExactAir provides pricing before work begins.

Should I repair my heating system or replace it?

It depends on the system’s condition, repair needs, age, performance, and the cost of continuing to operate it. ExactAir can evaluate the existing equipment and explain both options.

How do you determine what size heating system my home needs?

Equipment sizing should be based on the home’s heating requirements rather than simply matching the size of the old system. ExactAir evaluates the home before recommending replacement equipment.

Can you replace my heating system with a different type?

Depending on the home and existing infrastructure, different replacement options may be possible. ExactAir evaluates the installation conditions before recommending what is practical for the property.

How long does a heating replacement take?

The time required depends on the equipment, installation conditions, and whether additional work is needed. ExactAir will explain the expected scope before the replacement begins.

Will you test the new heating system after installation?

Yes. The system is started and checked after installation to verify proper operation before the replacement is considered complete.

If your heating system is nearing the end, replace it with a system that fits the home

Monday–Friday, 7am–7pm · 24/7 emergency service available