Festus, MO · Jefferson County

Mini-Split Heat Pumps for Targeted Heating and Cooling Without the Ductwork

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

ExactAir looks at the space, insulation, usage, placement, and electrical requirements to build a system around how you actually use the room.

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

Is a Mini-Split Heat Pump Right for Your Space?

Where Can Mini-Split Heat Pumps Solve a Comfort Problem?

Some spaces are difficult to condition with a traditional central HVAC system. A mini-split heat pump provides another way to add both heating and cooling where you need it.

Finished rooms without ductwork — Add dedicated comfort without extending the home’s existing duct system.
Room additions — Give a new space heating and cooling without rebuilding the central system.
Detached or attached garages — Make frequently used spaces more comfortable throughout the year.
Hard-to-condition bedrooms — Address rooms that consistently run warmer or colder than the rest of the home.
Home offices — Maintain a more consistent temperature in a dedicated workspace.
Converted spaces — Add climate control where the original HVAC system was never designed to serve.
Ductwork isn’t practical — A mini-split can avoid major duct installation in certain applications.
Independent room comfort — Condition a specific space instead of changing the temperature throughout the entire home.

What Happens During a Mini-Split Heat Pump Project?

ExactAir looks beyond the equipment itself. The space, system capacity, placement, and installation details all affect how a mini-split performs.

Understand the Space

We look at how the room is used, its size, insulation, windows, exposure, and existing comfort problems.

Determine Heating & Cooling Needs

The system is selected around the actual demands of the space rather than simply choosing equipment based on room size alone.

Plan Placement

We determine practical locations for the indoor unit, outdoor equipment, line set, drainage, electrical connections, and service access.

Select the Configuration

Equipment capacity and system configuration are matched to the space and the type of heating and cooling it needs.

Complete the Installation

The mini-split equipment and required connections are installed with attention to proper routing, placement, and system setup.

Test Heating & Cooling Operation

The completed system is operated and checked to confirm temperature performance, airflow, controls, and overall operation.

Why Jefferson County Homeowners Choose ExactAir for Mini-Split Heat Pumps

One System for Two Seasons

Get heating and cooling from the same mini-split heat pump throughout the year.

Built Around the Space

Equipment selection starts with the room and how it will actually be used day to day.

No Unnecessary Ductwork

Mini-splits can provide comfortable temperatures where adding traditional ducts isn't practical.

Installation Details Matter

Indoor placement, outdoor location, line routing, drainage, and electrical connections all affect the finished system.

The Work Gets Verified

ExactAir checks the system after installation instead of treating startup as the final step.

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

Mini-Split Heat Pump Service in Festus & Jefferson County, MO

ExactAir provides mini-split heat pump installation, repair, maintenance, and replacement in Festus and surrounding Jefferson County communities, 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 HVAC 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

Mini-Split Heat Pump FAQs

What is a mini-split heat pump?

A mini-split heat pump is a ductless HVAC system that can provide both heating and cooling to a specific room or area through an indoor unit connected to an outdoor heat pump.

Can a mini-split heat pump heat a room in winter?

Yes. Mini-split heat pumps are designed to provide heating as well as cooling. Actual performance depends on the equipment selected, outdoor conditions, and how the system is installed.

Do mini-split heat pumps need ductwork?

No. They use a refrigerant line connection between the indoor and outdoor equipment rather than traditional supply and return ductwork.

Can a mini-split heat pump cool and heat the same room?

Yes. The system can provide cooling during warmer weather and reverse operation to provide heating when needed.

Are mini-split heat pumps only for additions and garages?

No. They can also be used for bedrooms, offices, converted spaces, individual comfort zones, and other areas where targeted heating and cooling makes sense.

Can I replace an existing mini-split heat pump?

Yes. ExactAir can evaluate the existing equipment, its condition, capacity, installation, and performance before determining what replacement options fit the space.

Give the Space Its Own Heating and Cooling Solution

If one room never seems to match the rest of the house, a properly planned mini-split heat pump may provide the targeted comfort you’ve been missing.