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At System Test Dealer we strive for 100% satisfaction in everything we do. We value your opinion and invite you to tell us and others about your experience with us. Please take a few moments to tell us what you think by leaving us a review here on our website or on any of these popular review sites.

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See What Our Customers Have to Say -
19 Reviews

Gonk Droid Walking
11/11/2025
Located in Leslie
If you need honest help who will not try to over sale then us Aj. They are honest fair and all around great people. Any time talk of ac/ heat I tell people call these guys. I have an old house old system was told twice could not b fixed got spend 6k new system. Aj came looked at it put in a little part and we had heat. This was Christmas Eve also
Nate Reeves
08/27/2025
Located in Leslie
Alex is great and has always been quick to help us with any of our heating and cooling needs.
TWO FOR THE ROAD
07/28/2025
Located in Leslie
We had a complete new HVAC System installed by this company and they did a phenomenal job. They were completely professional and I had an issue come up with the thermostat and it was fixed within hours of calling the same day. Highly recommend.
Geri Knight
07/06/2025
Located in Leslie
Jessica Lane
03/25/2025
Located in Leslie
High recommend AJ Heating & Air Conditioning! I called last summer with an emergency outage and they fit me in same day, did a fix to get me through season with suggestion for replacing before next season. Just finished the install on the replacement and did not disappoint! They are all so knowledgeable and friendly. Clean up after themselves and can really tell customer service is a priority. My replacement required moving a hot water heater and rerouting from attic to laundry room and they did it all quick and efficiently.
Shellee Mitchell-Gann
01/24/2025
Located in Leslie
I had used several other companies who were unable to diagnose or fix the problems we were having. One visit from AJ Heating and they fixed the problems. Very professional and I HIGHLY recommend!
Patrick Simmons
12/29/2024
Located in Leslie
My furnace randomly went out the day after Xmas and AJ had a tech(Brian) out within hours and had us fixed up in no time. Brian was a great tech, super nice and very knowledgeable and had it running with ease. I cannot recommend this business more. Fast, trustworthy and reliable.
Gloria Bielicke
11/19/2024
Located in Leslie
We had an attic gable fan put in and the app didn’t want to work right. Alex and his crew worked at it until they got it figured out. Terrific work and great people.
Renita Koch
08/29/2024
Located in Leslie
Very satisfied with Brian's knowledge experience explained everything thoroughly will use again
Tom Cronin
08/27/2024
Located in Leslie
Alex and Brian always take great care of us when it comes to repairs and new installs. From our rental properties, to our own home. Thank you
Cheri Scheer
08/01/2024
Located in Leslie
Alex was here at the time he said he would be. Found the problem, ordered the part and was back in a few days. Did a great job. Very conscientious of our home and our time.
Chris Westrick
06/17/2024
Located in Leslie
My a/c went out Saturday (one of the warmest days of the year so far). Alex showed up and promptly figured out that my thermostat wasn't working. He had pretty much the exact model on his truck and got it swapped out quickly and got me back in service. Thanks AJ Heating and Air-Conditioning for such awesome service!
Vince Dangelo
02/18/2024
Located in Leslie
Alex @ AJ Heating and Cooling was top notch. Furnace went out unexpectedly and came to the rescue. Came out and within 5 mins figured out the problem, replaced it and saved us from the cold! Great service, experienced and fair pricing! 5 out of 5.
Dan Cronin
01/13/2024
Located in Leslie
I can’t say enough great things about AJ Heating and Cooling! Alex is wonderful to work with as well as Brian. Very knowledgeable and professional and this goes for everyone of his team members. You can tell they take pride in their work and really enjoy helping people. I hired them for a full New HVAC installation and all new ductwork. They did such an impressive job and I highly recommend AJ Heating and Cooling for any HVAC needs.
Michael Becker
12/20/2023
Located in Leslie
We've been using AJ Heating and Air Conditioning to service and maintain our two Carrier Heat Pumps. Brian, AJ's service tech, is very thorough and friendly. He explains everything he's doing and answers all our questions. We're signed up on their maintenance program to service our units twice a year. We appreciate Alex and all the folks at AJ Heating and Cooling for their excellent and friendly service.
Steve Sulze (Xtreme Krav Maga STL)
07/29/2023
Located in Leslie
Needed an emergency service call for HVAC not cooling on a weekend, called and AJ was on vacation but was still able to get a tech out to diagnose the issue within an hour, Fantastic service!
Merle George
04/05/2023
Located in Leslie
Bryan was great! Very knowledgeable, and takes pride in his work. Was very helpful and informative, and got the job done fast... I highly recommend this company!
Amy Pecka
06/18/2022
Very fast and professional service!!
Rhonda David
02/17/2022
Alex was very easy to work with, professional, and completed his job in a timely manner. I would highly recommend his business.