Your #1 Choice for Furnace Repair in the Fond du Lac Area!


What Your Neighbors Say About Us

We absolutely love our Units! So glad we had them installed. Would highly recommend the Mitsubishi Ductless to anyone who can’t have Central Air.


HI Diane, We really like our new furnace and thermostat. Our dining room is much warmer and the furnace is very quiet. It will be interesting to see how our AC works with this next summer. I think Tim and Larry did a nice job for us and so did you.


The furnace is working great and the installers were helpful and explained everything to us. Also thank you for responding to our call so quickly it was appreciated by all of us.

Have a great day.

Your Service Man, Ryan, was amazing! He kept working in the sweltering heat, even though this was a last-minute appointment. He wasn’t going to leave until we had air conditioning! This is the second time I’ve had Kohlmann do work for me, and have been pleased and impressed both times.

Thank you,
-D. Thompson

I just wanted to let you know how happy we are with the furnace and central air. The guys were fantastic and did a wonderful job. I was very impressed by how nice they were.

You were right about that cold air return being a bear to put in, but it's in and it is wonderful.

Again, thank you for everything.

Thank you to everyone at DR Kohlman for the professional handling of the duct cleaning at St Peter Lutheran Church. We look forward to seeing how well our air moves in the building now.

All of the staff that we worked with, Diane, Sean, Dave and Ryan were excellent and very nice to work with.

Thank you again
-Connie M.

The entire staff couldn’t have been nicer. They were exceptionally helpful and professional. We couldn’t be happier with the service we received. We recommend them wholeheartedly.
-Laura H.

Thank you for the quick service on a Saturday at the apartments."
Happy Holidays!"

"We are very pleased with the Mitsubishi system - keeping the entire house more heat regulated as we are not fighting to keep that room warm:). Thank you again for everything."

“Wow Diane! What a beautiful Cover-Guard install. It takes skill and commitment to leave behind a job to be proud of. Kudos to you and your Installers.” 
-Ken L.

“Thanks for the good service and communication throughout, it has been a good experience working with all of you.” 
-Mark P.

“Shawn and Diane, thanks for all your help.” 

“Thanks, the Geo-Thermal system works fine now.” 

“Thank you for your quick and reliable service.” 

“Thank you Ryan.” 

“Jim is a keeper.” 

“Thank you for a job well done!” 

“Thank you for sending the notice regarding the dehumidifier recalls due to fire hazard. I checked ours and it was not part of the recall.
I appreciate that you took the time to email your customers and made it easy to check the status of the unit.
It is reassuring to deal with a company that demonstrates this type of concern for their customers, an uncommon occurrence in today's business world.” 
Thank you,
-Terry R.

“Our home has a rather involved hot water baseboard heat system that has 4 zones using motorized valves. The technician assigned our repair on 3/9/2015 knew exactly what to do. Dave was on time, quick to find the problem and make the correction. We appreciate the good service.” 
-Dan O.

“They scheduled work at the last minute before I left for six weeks. Were there when scheduled, worked efficiently, top quality workmanship, took time to discuss my issues and try to analyze my boiler system’s changes that were made years ago. Great service department, great techs!” 
-Jay M

“As much as we ‘didn’t want’ to have to have a new furnace put in, D.R. Kohlman made the process as easy as possible. From the financing to the actual install, they were on their game and had the work done in just a few hours. Good job!” 
-Yvonne P

“Very responsive and professional. Would definitely recommend them.” 
-Chris A

“As usual the work was done efficiently and professionally.” 
-Lynn S