Festus, MO · Jefferson County

Heat Pump Installation Designed for Year-Round Comfort

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

ExactAir evaluates your home’s heating and cooling needs, existing ductwork, electrical requirements, equipment placement, and system configuration before installing and commissioning the new heat pump

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

Signs Your Home May Be Ready for a New Heat Pump

When Does Heat Pump Replacement Make Sense?

A failing heat pump isn’t the only reason to consider installation. Changes in comfort, operating costs, or the home itself can make a replacement worth evaluating.

Frequent breakdowns — Repair calls are becoming more common or more expensive.
Poor heating performance — The system struggles to keep the home warm.
Weak cooling — Summer comfort has declined even when the system runs.
Uneven temperatures — Certain rooms consistently feel different from the rest.
Long operating cycles — The system runs for extended periods without keeping up.
Rising energy costs — Operating expenses have increased without a clear change in usage.
Aging equipment — An older heat pump may be approaching replacement time.
Home changes — An addition or remodel may have changed the home’s heating and cooling needs.

What Actually Happens During a Heat Pump Installation

A heat pump installation is more than setting a new outdoor unit beside the house. The equipment and the systems supporting it all have to work together.

Home & Existing-System Review

We look at the home's heating and cooling requirements, current equipment, ductwork, airflow, and installation conditions.

Heat Pump Sizing

We determine the appropriate system capacity for the home rather than automatically matching the size of the old equipment.

System Configuration

We review the indoor and outdoor equipment combination, controls, electrical requirements, and other components needed for the installation.

Installation Planning

Equipment placement, line-set routing, drainage, electrical connections, airflow, and service access are considered before installation begins.

Heat Pump Installation

The new equipment is installed, connected, and set up according to the manufacturer's requirements.

Startup & Commissioning

We operate the system in its required modes, check temperatures and performance, verify controls and connections, and make sure the completed installation is operating properly.

Why Jefferson County Homeowners Choose ExactAir for Heat Pump Installation

One System, Two Jobs

We account for the fact that your heat pump needs to provide both heating and cooling.

Sizing Is Not an Afterthought

The replacement system is selected around the home's actual requirements, not simply the equipment being removed.

Existing Conditions Get Reviewed

Ductwork, airflow, electrical needs, equipment placement, and other installation factors are considered before work begins.

Commissioning Matters

A finished installation is not the finish line. The system is operated and checked after installation.

Local, owner-led service

ExactAir is based in Festus and provides residential HVAC service throughout Jefferson County and surrounding communities.

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

Heat Pump Installation in Festus & Jefferson County, MO

ExactAir installs residential heat pump systems 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 Heat Pump 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

Heat Pump Installation FAQs

How much does heat pump installation cost?

The cost depends on the system size, equipment selected, existing ductwork, electrical requirements, installation conditions, and other project details. ExactAir can evaluate the home before providing an installation price.

How do you determine what size heat pump my home needs?

Sizing considers the home’s heating and cooling requirements along with factors such as the building, existing system, airflow, and installation conditions. The old system’s size is not automatically the answer.

Can a heat pump replace my existing furnace and air conditioner?

In some homes, a heat pump can provide both heating and cooling. The right configuration depends on the home’s requirements and the existing HVAC setup.

Will you inspect my existing ductwork before installation?

Yes. Existing ductwork and airflow can affect how well a new heat pump performs, so those conditions should be considered as part of the installation.

Does a new heat pump need to be tested after installation?

Yes. Startup and commissioning should include operating the system, checking performance, verifying controls and connections, and confirming that the completed installation is functioning properly.

How long does heat pump installation take?

Installation time varies with the equipment, existing system, accessibility, and work required. ExactAir can explain the expected scope after evaluating the installation.

Install a heat pump that is matched to the way your home actually needs to operate

If you’re replacing an aging system or changing how your home is heated and cooled, ExactAir can evaluate the installation and build the replacement around the home.