Installation & Repair

D.R. Kohlman, Inc. is proud to provide exceptional heating, air conditioning and ventilation services to customers across eastern Wisconsin, with work ranging from small residential to complex commercial and design-build projects. We strive to continuously improve our service and remain current with the rapidly changing technology and equipment in our industry so that we can consistently serve our customer’s needs.

Keep your HVAC Systems Running Efficiently

Yearly maintenance on heating and air conditioning systems can help reduce costly repairs and extend the life of your system. Join the D.R. Kohlman Preferred Customer Club  today to keep your HVAC systems running efficiently and start saving on your heating and cooling costs!

24 Hour Emergency Repair Service

No matter what problem you are having with your home comfort system, we can help. Call D.R. Kohlman at 920-999-4631 any time of the day or night, and one of our friendly, highly trained service technicians will be there to get your system back up and running the way it should be.

HVAC Systems Installation and Service

D.R. Kohlman sells, installs and services heating, cooling and ventilation equipment from many of the top home comfort and indoor air quality equipment manufacturers in the world:


Trane Heating, Cooling and Air Cleaning Systems

Ameristar Heating and Cooling Systems 

GeoComfort Geothermal Systems

HI-Velocity Mini-Duct Heating and Cooling Systems

Mitsubishi Electric Zoned Heating and Cooling Solutions

Viessmann Boilers

Warmboard Radiant Subfloor

Roth Industries Radiant Floor Heating

Empire Comfort Systems Direct-Vent Heaters and Fireplaces

Renewaire Energy Recovery Ventilation Systems 

Aprilaire Air Purifiers, Humidifiers and Dehumidifiers

Santa Fe Free-Standing High Efficiency Dehumidifiers 

Second Wind Germicidal Object and Air Purifiers 

Honeywell Programmable and Wi-Fi Home Automation Thermostats; Humidifiers


Our service and installation technicians receive specialized training through apprenticeship programs in sheet metal fabrication, pipe fitting, and heating and refrigeration service, as well as on-site training at manufacturers’ training centers. We are proud to maintain the designations of Trane Comfort Specialist, and Mitsubishi Electric Diamond Contractor:


Trane Comfort Specialist

Trane Comfort Specialist

The designation of Trane Comfort Specialist is earned by continuing to meet the highest Trane standards for customer satisfaction and continuing education. Our technicians are trained to guide you in selecting the best Trane comfort system for your home, and provide expert installation, maintenance and service.


Mitsubishi Electric Diamond Contractor

Mitsubishi Electric Diamond Contractor 

Our certification as a Diamond Contractor indicates the highest level of accreditation, awarded to professionals who have developed exceptional expertise through years of experience, and extensive hands-on training at a Mitsubishi Electric approved training center.