HVAC reviews in New Berlin, Wisconsin

I called for emergency service and the technician Hayden, called me back and then arrived at my house in no time. He was very professional and immediately went downstairs to take a look at my furnace. My furnace is just a little over a year old and it turned out that there was nothing wrong with it. Hayden said that it just needed to reset itself for the heat to start coming out. When he was done and he came upstairs, I asked him how much for him coming out And he said there would be no charge, because I had the coupon. So nice to know that I can count on Thielman Heating and Cooling. Very trustworthy company!!! Hayden was Awesome 👍👍👍

Hayden was both professional & knowledgeable with questions I had. They cleaned up after themselves also after installing my new hot water heater which is guaranteed for 10 yrs unlike others that only last 6-8yrs. Thanks again I would also like to comment on my visit from Kyle to diagnose my problem water heater,which he did. Thanks for your knowledge & professionalism also!

We had Todd H from Thielman come out to service our HVAC system, and we were thrilled with his work. Todd was courteous, knowledgeable, and he tremendously helped us figure out solutions to our HVAC system we were not aware of. There's nothing better than having good people do good work when you can't do it yourself, and Todd from Thielman is one of those people. I highly recommend Thielman, both for their installation and service expertise in residential HVAC. If I could give them more than 5 stars, I would.

Matt C. led the installation of a new furnace system today, 12/29/25. He is very knowledgeable and thorough in explaining what was being done. Very helpful answering my questions. A very neat and clean installation. I very much appreciate the consciencous attitude and thorough approach of Matt and the crew.

Benjamin was on time, polite, explained everything is new, how to adjust water heater and thermostat. Noted the manuals that came with boiler and water heater. Reminded me to call if I have any questions or concerns.
Thank you
Happy holidays!✌️

It was a pleasure having Kyle service our hot water heater today. I was not clear on the proper procedure flushing this system. Kyle explained the required steps and answered all of my questions.
He really had a great attitude and he is a huge asset to your Team.

Benjamin G was here in Fri. Jan. 16 arriving on time as scheduled. He replaced my old furnace (manufactured in 1988). All the galvanized housing and PVC pipe was modified to fit. The old furnace was much larger than the new one. I am very pleased with how this all went down. I would highly recommend Benjamin G. Clean up went well, they did a great job!

Makinze C. from Theilmann’s was sent to check out our furnace to do a tone up and inspection.
Mac did a great job going over everything on the furnace explaining what he was doing.
He was very thorough and meticulous with his inspection.
My wife and I were very impressed and happy with “Mac’s” work.
I would not hesitate to recommend him to anyone to service their furnace or air conditioner.

Extremely helpful in my decision to buy a new furnace with Thielmann. Stood by me while I was talking to previous furnace installer .. therefore making my decision much easier. A real pleasure doing business with Thielmann.
Also for the installation of the furnace and exhaust system, Jeff D and his crew were so very efficient, like clock work .. everyone had their job to do. So great job!! Especially just before the below zero weather coming. That's no time to be without heat.

When your furnace needs to be replaced in the middle of winter, one would expect to pay a lot. Gregg answered the phone on the first ring and quoted a new furnace that was only slightly more than what I had paid 23 years ago for the old one!
The crew worked fast and the house only lost 8 degrees in the time it took to put it in.

Gregg Heating is for sure...the place to call!

Fantastic service! Both our A/C unit and furnace have been replaced with great customer service. Very clean and neat. Options given and explained in various price ranges. Punctual with arrival times. Highly recommended. A+ all the way.

I have used Gregg Heating on three separate occasions, and each time they’ve gone way above and beyond for me and my family. Most recently, our furnace died overnight and we woke up freezing as it had just snowed 4”. I called Kyle on his cell phone...and he answered...while on vacation...in a tree.

He walked me through troubleshooting the issue, had his office order the part for me, then called me back to see how it turned out. He did all of this while deer hunting, on his own personal time. (Not surprisingly, the furnace fired up and sounded better than ever! )

Not only are Kyle and his people great at what they do professionally...they go above and beyond to ensure their customers are happy. And they do it with a smile on their face.

5 stars!

Best service technicians and customer support, often able to get same day service. Today our air conditioning went out, called Gregg Heating, Kyle came right out found our problem replaced wire and we are cooling 😎.

Excellent service and competitive pricing. The team of installers were very helpful and friendly. Our new furnace and air conditioner have already made a huge difference in the comfort of our home.

I've now used Gregg Heating 2x and both times the guys that came to the house were honest, professional and very willing to provide lots of feedback about the problems and what type of troubleshooting I can do before giving them a call.

Owning a home can be stressful without heat and pets at home all day.. They've gone above and beyond to make it really stress free.

The woman who has answered the on the weekends both times was quick and helpful.

Got a response from a tech shortly after the call to the office.

Would highly recommend giving them a call if you need reliable heating help.

I needed my AC unit moved and the service was excellent. Friendly, professional, efficient, on time, and fair pricing. I highly recommend Gregg Heating and Air Conditioning and will be using them for any HVAC needs I may have going forward.

Fantastic service; came out and properly diagnosed my problem and they moved things around to install a new furnace first thing on monday morning. I even priced checked them and they were much lower and provided great quality service...they will be my heating and AC company for life.

Kyle and Antonio put in our new furnace, air cleaner and humidifier.
They did an awesome job and clean up was fantastic. Price was very competitive.! Wonderful job.
Thanks guys 👍

Kyle and his team replaced my AC system quickly and ahead of schedule. Thankful to have such a reliable company in the area. You won't be sorry for using Gregg Heating & Air Conditioning for all your HVAC needs.

We’re positively impressed with the recent service we received from Gregg Heating & AC, and with that experience in its entirety. Every aspect of the project, from our seeking an estimate from them to completion of the specific job was handled with genuine courtesy and professionalism. No outside party nor subcontractor was involved.

Promptly following the initial appointment for an estimate an accurate description of what was proposed in person was emailed to me as promised. My reply and agreement to go ahead was soon responded to with a friendly phone call from the scheduler offering to set up a date for the desired installation appointment.

On the morning of the appointment date I was greeted with yet another friendly call from the scheduler informing me of those who were on their way, and who did indeed arrive on time and as expected. The labor was performed with expert care and attention to the details, which included their draping of the carpeting leading to the work area and a thorough cleanup (such as vacuuming and removal of all extraneous materials) once the job was complete.

The actual price was as quoted, though could certainly have been adjusted upward as due to an unforeseen obstacle that revealed itself once the work began. Alternatively I was offered the opportunity to leave a specific and honest review, which I was happy to accept. Payment by credit card was pleasantly accepted, and a hard copy receipt on company letterhead was provided for my record. In short I rate my experience with Gregg Heating & Air Conditioning as follows:

Communication: A
Customer Service: A
Timeliness: A
Expertise: A
Workmanship: A
Product or materials: A
Integrity: A
Clean up: A
Price: A

Greg's heating and air conditioner.
This company was so polite, informative came to my rescue the same day I called. What an beautiful furnace, I'm warm again. And my basement was very clean before leaving. Thank you.