Festus, MO · Jefferson County

AC Replacement Without Guessing What Comes Next

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

Replacing your air conditioner is a bigger decision than fixing a single failed component. ExactAir starts by looking at the condition of the existing system, the problems you’re experiencing, and what makes sense for your home.

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

When Is It Time to Replace Your AC?

Not every cooling problem calls for a new system

A repair may be enough in some situations. In others, continuing to put money into an aging or unreliable system may not make sense. These are some signs that it’s worth having the replacement conversation:

What Actually Happens During an AC Replacement Visit

A new system starts with understanding the old one

ExactAir doesn’t treat replacement as simply removing one box and installing another. The ExactAir Method is used to assess the existing situation, explain the options, complete the work properly, and verify the finished system.

Exact Assessment

The existing cooling system and the problems you're experiencing are evaluated before a replacement recommendation is made.

Exact Findings

You'll see what was checked and what was found, including conditions that may affect the performance of the new system.

Exact Options

If repairing the existing equipment still makes sense, you'll know that. If replacement is the more practical path, ExactAir will explain why and show you the available direction.

Exact Pricing

The replacement cost is presented before work begins, giving you the information needed to make the decision without pressure.

Exact Installation

The new equipment is installed according to applicable manufacturer requirements, with attention to the details that affect how the system operates.

Exact Verification

The completed system is tested and checked before the job is considered finished. The goal is a working cooling system—not simply a new piece of equipment in the home.

Why Jefferson County calls ExactAir

Replacement should be based on the condition of the system

A replacement recommendation has a reason

ExactAir explains what is happening with the existing system instead of treating every older AC as an automatic replacement.

Repair and replacement are both considered

If a dependable repair is still the right answer, you'll be shown that option. Replacement is not pushed simply because a new system can be sold.

Clear information before a decision

You get the findings, available options, and pricing before deciding how you want to move forward.

Installation is treated as technical work

ExactAir's capabilities include performance testing, air balancing, duct design and fabrication, static pressure testing, commissioning, and refrigerant charge verification.

Owner-level accountability

Brett Lahue leads ExactAir and brings owner-level responsibility to the work performed in your home.

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

AC Replacement in Festus & Jefferson County, MO

ExactAir Heating and Cooling is based in Festus, Missouri, providing air conditioning replacement and installation services primarily throughout Jefferson County and surrounding communities. The standard service area generally extends about 45 minutes from Festus

Note: A trip fee applies beyond the standard service radius. Service in St. Louis City and St. Louis County is currently limited while additional licensing is being addressed.

What Customers Say About ExactAir's Work

Real experiences from ExactAir customers

    
 
 
         
   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.

Common questions

AC Replacement FAQs

How do I know if I should replace my AC instead of repairing it?

The answer depends on the condition of the equipment, the repair required, and the overall value of continuing to maintain the existing system. ExactAir looks at the situation first and explains both paths when appropriate.

How much does AC replacement cost in Festus, MO?

There isn’t one replacement price that applies to every home. Equipment, installation requirements, existing system conditions, and the scope of the work all affect the final cost. ExactAir provides pricing based on the actual replacement situation rather than giving you a generic number.

Should I replace my AC before it completely fails?

If your system is becoming unreliable or repair costs are adding up, discussing replacement before a complete failure can give you more time to make a decision. ExactAir can assess the current system and explain what makes sense based on its condition.

Can you replace my existing AC system with a different setup?

ExactAir provides AC installation and replacement, including ductless mini-split systems. The appropriate solution depends on the home, existing equipment, and the requirements of the project.

Do you replace all AC brands?

ExactAir provides service and replacement for residential cooling systems. If you’re considering replacing an existing system, provide the equipment information during scheduling so the team can determine the appropriate next step.

Do you offer emergency AC replacement?

ExactAir offers **24/7 emergency service**, but an emergency service call and a planned replacement are different situations. If your existing AC has failed, contact ExactAir so the current condition can be assessed and the available options explained.

If replacement makes sense, you'll know why.

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