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New Berlin






Menomonee Falls


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New Berlin




Menomonee Falls




Please take a moment to find out why Thielmann & Son is the top choice for furnace & air conditioner (HVAC) repair and heating installation service in Milwaukee, Menomonee Falls, New Berlin, Hartford, and Burlington.


We love it!

With our old furnace, whenever we were watching TV and the furnace would come on we had to put the volume up as the furnace was so very loud. Now with our Lennox furnace no volume adjustment is necessary. We also love the temperature stability when the furnace is in between cycles and is off.
Ann Dilla

Very Happy!

The staff @ John Thielmann & Son were very professional, knowledgeable, couteous and answered all questions timely. We are very happy for choosing John Thielmann & Son. We definitely will use them in the future and will refer other people to them.
Vincent and Nancy Murphy

Well Done!

All aspects from sales to installation were done in a professional and couteious manner. We appreciate a job well done.
Chris Denning

Thank you!!

I am very very pleased with the way Thielmann & Son came and in-stalled my new Lennox furnace. They were on time in getting here, they cleaned everything up and were very careful in taking out the old furnace & bringing in the new one. I got my programmable thermostat which I asked for and one of the fellas even went out to shovel the snow off my patio because I mentioned that I was nursing a bad back & was not able to clean off the patio and that the sun was going to have to melt it all off. I did call and talk to a Jason at Thielmann to let him know how pleased I was with their work and with my new furnace. I now have a quiet furnace instead of a noisy one & I'm told it will be more efficient. Thank you Lennox and Thielmann!!
Patty Schwier

Great Communication!

The sale went off very good. Communication was great and the installation techs were very friendly and kept us informed at all times.
Terry Lehn

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