St. Louis HVAC contractor

Management Team


A St. Louis HVAC Contractor You Can Trust

At Dunn Heating  & Cooling, providing solutions to your indoor comfort challenges is something we take great pleasure and pride in. We’re an independent Trane Comfort Specialist™ dealer who offers the best products in the industry, and our team is dedicated to providing you with the attention to detail and customer service that can create a whole new level of comfort.

Led by owner Brett Nejmanowski, our company provides expert heating and cooling service and installation.  Our team of technicians is fully qualified to help you select the comfort system that best fits your home and your budget.  Our written 100% satisfaction guarantee is behind all the work we do – if you’re not happy with our heating and cooling services for any reason, we’ll make it right or give your money back, no questions asked!  No matter if it is a furnace repair, AC repair, furnace installation, AC installation, heat pump installation, or anything heating and air conditioning-related, you have our guarantee.

Along with the services we provide, we’re also passionate about our duty to protect the environment and our social responsibility to the community. In our daily practices, we utilize earth-friendly products and methods to ensure clean outdoor and safe indoor environments for the people we serve.

We regularly give back to the community through volunteer work and financial donations. Among the charitable organizations we support are Safe Kids USA, National Multiple Sclerosis Society, Autism Speaks and the Sheriffs’ Association.

Enthusiastic service, quality products, community involvement. For service and support you can count on all year long, Dunn Heating & Cooling has you covered.

Service Areas:

Our St. Louis services areas include the following cities: Chesterfield, Oakville, Wildwood, Ballwin, Mehlville, Kirkwood, Maryland Heights, Webster Groves, Affton, Manchester, Lemay, Creve Coeur, Clayton, Crestwood, Town and Country, Richmond Heights, Ellisville, Ladue, Des Peres, Sunset Hills, Brentwood, Olivette, Shrewsbury, Valley Park, Glendale, Rock Hill, Fenton, Frontenac, Warson Woods and Huntleigh. Contact us today!

Dunn Heating and Cooling is made up of a team of committed people who are ready to assist you take the hassle out of choosing a heating and cooling company.






Brett Nejmanowski


Brett Nejmanowski is the President of JT Dunn HVAC and places a huge emphasis on customer service.  Call his company for whatever concern you may have and they will offer solutions. Brett has two decades of experience in the HVAC field and also received a Bachelor of Information Systems degree from the University of MO. Not only his he a licensed HVAC Journeyman but he is also a certifed BPI Energy Auditor.  Brett and his team at JT Dunn HVAC recently received a 2013 Rising Star Award and Excellence in Customer Service Award amongst all Trane dealers in the central region of the United States. These awards just go to show his devotion to his customers and overall quality.

Chad Ray

Installation Manager

Chad Ray is the install foreman at JT Dunn HVAC.  He has over 26 years of experience including managing 40 technicians for an HVAC new construction firm.  Now Chad likes to focus on building high end heating and cooling comfort systems.


Chad loves this industry so much he regularly dreams about building heating and cooling systems – seriously – often he shows up to work on his days off just to build sheet metal.  Did we mention he’s personable?  If you meet him at your job site you will end up clearing your schedule to kick back and drink lemonade with him. So if you have appointments to hold that day then don’t say we didn’t warn you.

Romonda Reynolds

Office Manager

Romonda Reynolds is the Office Manager at JT Dunn HVAC.  If you get the opportunity to chat with her you won’t be disappointed – she has a charming personality as you can probably see in her warm smile.  With decades of experience from fortune 500 companies, she brings a great deal to the table at JT Dunn HVAC for our customer service department and overall organization of the company.

Jimmie Jones

Trusted Operations Manager

Jimmie Jones, aka Smooth Operator, is the trusted operations manager at JT Dunn Heating and Air Conditioning.  With over 30 years of experience in the HVAC Industry there isn’t much he hasn’t encountered.  His work ethic and desire to deliver a high standard of customer service fit well with the culture at JT Dunn HVAC.  We are happy to have him aboard and look forward to a many years of smooth operation.


Lead Generator


Project Manager




Service Supervisor


Lead Technician




Lead Technician

Just a little affirmation that we GET IT DUNN RIGHT for our customers.

If numerous experts of the industry are continually recognizing our positive achievements for our customers then maybe you should realize them in your own home.



  • Angie’s List Super Service Award 2014
  • Angies List A Rating and Gold Service Award
  • Ameren Missouri ActOnEnergy Excellence in Energy Efficiency Award 2014
  • Best of Ballwin Award 2015
  • Home Advisor Pro 2015
  • Trane Excellence in Customer Service 2013, 2014
  • Trane Rising Star Award 2013
  • Trane Comfort Specialist
  • Mitsubishi Diamond Dealer
  • Mitsubishi Summer Top Volume Dealer St Louis Region
  • The Home Depot VIP Service Provider
  • Better Business Bureau A+


At Dunn Heating & Cooling we get it…  Your home is YOUR HOME.  We treat your home with respect like YOU would.

Dunn technicians live and work to a higher standard.  We wear booties in the home, lay down tarps over floors, clean up after we are done, and do not smoke on tobacco products on the homeowners property.  Our goal is to arrive on time, fix the problem quickly, and leave no trace of our presence except for the added comfort and energy savings.

Rest assured you are working with a company that places great emphasis on hiring qualified, background checked individuals to enter your home.  With the fact that HVAC is a popular trade taught in prison a homeowner can’t be too careful when selecting who to do business with.  We do the work for you and only send the highest quality.  With our 100% satisfaction guarantee – you’re covered.


scale2At Dunn Heating and Cooling we understand a comfortable home means you and your family are happier, healthier, and more productive.  This is why we have expanded our indoor comfort knowledge to include building science not just heating and cooling.

Studies prove a heating and cooling company that understand the whole home as a system better understands how to provide more comfort and more energy savings making you happier all the way to the bank.

Unless a heating and cooling company understands the whole home they will just think a bigger furnace or AC is the solution (more air.)  This is not always the case though as sometimes some rooms just simply need better insulation, air sealing, or a duct redesign rather than the expensive new AC or furnace.  We will find the most cost effective solution to solve your comfort problem AND we won’t just simply try to sell you the solution that makes us the most money.  The whole home approach to comfort and energy savings is the best alternative.


The owner, Brett Nejmanowski, regularly educates homeowners on how to solve their comfort and energy problems the right way.  The DUNN way.  Get it Dunn Right –  Call anytime for advice on your next home project.


Did You Know:

  • Typically 80% of air leakage travels through 20% of the leaks. Find the 20% and seal them.
  • Air traveling through insulation can reduce the R-Value (insulation value) by 75%
  • Attic ventilation can determine whether a house is comfortable or not
  • Many home comfort problems can be solved by simply air sealing, insulation, or duct modifications rather than just putting in a bigger, more costly heating and cooling system.