Festus, MO · Jefferson County

Ductless Mini-Split Systems Designed Around the Space You Actually Need to Condition

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

Some rooms don’t need a full duct system to stay comfortable. A ductless mini-split can deliver dedicated heating and cooling where extending ductwork isn’t practical — additions, converted spaces, garages, bedrooms, offices, and other areas with their own comfort needs.

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

Signs a Ductless Mini-Split May Make Sense

Does one part of your home need a different solution?

Not every comfort problem is solved by adding another duct run. A ductless system may be worth considering when you notice:

A room that stays uncomfortable even when the central system is running
An addition or finished space without existing ductwork
A garage or workshop that needs dedicated heating or cooling
One area of the home that needs its own temperature control
Ductwork would require major remodeling to reach the space
You want independent comfort control in individual rooms
A converted space has become part of your everyday living area
Existing ductwork can’t practically serve the space

What Happens During a Ductless Mini-Split Visit

What we evaluate before recommending a system

A mini-split is more than an indoor head mounted on a wall. ExactAir looks at the space, installation requirements, equipment configuration, and how the system will actually perform once it’s operating.

Exact Space Assessment

We look at the room or area being conditioned, how it is used, its layout, insulation, windows, exposure, and other factors that affect the heating and cooling requirement.

Exact System Sizing

The equipment is selected around the space rather than simply matching the size of an existing system or choosing the biggest unit available.

Exact Placement

Indoor and outdoor unit locations are considered for airflow, access, appearance, drainage, line routing, and practical serviceability.

Exact Configuration

Single-zone and multi-zone options are evaluated based on how many areas need independent comfort and how the system needs to operate.

Exact Installation

Refrigerant lines, electrical connections, condensate management, mounting, and other installation details are completed according to the equipment requirements.

Exact Verification

The system is tested after installation or service to confirm operation, controls, airflow, and overall performance before the job is considered complete.

Why Jefferson County Homeowners Choose ExactAir for Ductless Mini-Splits

A system matched to the space

Mini-split equipment is selected based on the actual area being conditioned and how that space will be used.

Comfort without unnecessary ductwork

Ductless equipment can provide dedicated conditioning in areas where extending the home's existing duct system isn't practical.

Installation planned before equipment is mounted

Placement, line routing, drainage, electrical requirements, and service access are considered before the installation begins.

Heating and cooling in one system

Many ductless systems can provide both cooling and heat, giving the space year-round comfort from one system.

Owner-level accountability

Brett Lahue is personally responsible for the work and customer experience ExactAir provides.

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

Ductless Mini-Split Service in Festus & Jefferson County, MO

ExactAir is based in Festus and provides ductless mini-split installation, service, and maintenance throughout Jefferson County and the surrounding St. Louis Metro area, generally within about 45 minutes of Festus.

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 Mini-Split Work

    
 
 
         
   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

Ductless Mini-Split FAQs

What is a ductless mini-split system?

A ductless mini-split is a heating and cooling system that connects an outdoor unit to one or more indoor units without requiring traditional supply and return ductwork. It can provide dedicated comfort to individual rooms or multiple zones.

Are mini-splits good for rooms without ductwork?

Yes. That’s one of the primary applications for ductless systems. They can be useful for additions, finished rooms, garages, offices, and other areas where extending existing ductwork isn’t practical.

Can a mini-split heat as well as cool?

Many ductless mini-split systems are heat pumps that provide both heating and cooling. ExactAir can determine whether a particular system configuration is appropriate for the space and the home’s needs.

Can one outdoor unit serve multiple rooms?

Yes, depending on the equipment configuration. Multi-zone systems can connect multiple indoor units to one outdoor unit, allowing different areas to have individual temperature control.

How do I know what size mini-split I need?

Sizing depends on the room or home’s actual heating and cooling requirements, not simply the square footage. ExactAir evaluates the space and relevant conditions before recommending equipment.

Do you maintain and repair mini-splits after installation?

Yes. ExactAir provides service and maintenance for ductless mini-split systems, including systems that need cleaning, performance checks, troubleshooting, or other service.

Give the space its own comfort without forcing the whole house into the same solution.

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