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Trust Thelen to deliver the products and services to keep you comfortable all year round. We are a leading provider of Residential Heating and Air Solutions that include: Furnace, Air-Conditioning, Boilers, Air Exchangers, Ventilation, Air Purification, and Radiant Heating Systems.


Living in Minnesota, the last thing you want is a broken radiator or furnace in the middle of winter, so we’re here 24/7 to help you! Thelen recommends and installs only the finest, most innovative residential heating systems available in the market. From quiet and energy efficient, to reliable and consistent, we believe that the up-front investment in a quality heating system will deliver many years of comfort and reliability.


Quiet, efficient, cold, and environmentally friendly...that’s what consumers demand from today’s air conditioning units and that’s what Thelen delivers. We know it’s never a good time for your air conditioning unit to break down, but Thelen is available 24/7 to get you back up and running as soon as possible. On those hot summer days, trust us to keep you cool.


Today’s boilers are far more efficient than boilers of the past, and Thelen makes it easy to find the right boiler for your home. Trust our experts to install only the best and most energy efficient boilers on the market while also saving you money. Our technicians will do the job right the first time, for a safe and hassle free experience. Let us help improve the comfort in your home.

Air Exchangers

Most will agree that having fresh air in your home or business is very important and air exchangers are excellent at helping maintain fresh and cool rooms. It is far more efficient than opening an outside door or window and it can be a great way to ventilate a room and to stop the air from growing stale. At Thelen our service technicians are trained and certified to install air exchangers and they would love to talk to you about installing one today.

Ventilation & Air Purification

If you have allergies, are frequently stuffed up and/or coughing, you may need air filtration, humidification or purification in your home or business. Thelen is an expert at efficiently circulating heated/cooled air throughout the home. With our in-house sheet metal fabrication capability, our experienced staff is able to design, build and install complete duct work/ventilation systems. According to the EPA, the air inside your home may be up to five times more polluted than the air outside. But the good news is, Thelen leads the way by offering indoor air quality systems that are proven to improve the air you breathe.

Radiant Heating

Energy efficient heating for environmentally friendly buildings:
Thelen Heating is now a Certified Installer and Service provider of many different Radiant Heating Systems. Radiant heating system works by circulating warm water through a network of cross-linked polyethylene (PEXa) pipes placed in the floor. The surface area of the floor gently radiates heat evenly and consistently throughout the room. A quiet, clean and economical heating application, it works with a variety of heat sources and floor coverings.

Located in the Brainerd lakes area, Thelen Heating and Roofing Inc. is Minnesota’s premier single source provider of Commercial Roofing, Heating, Cooling and Ventilation systems for residential and commercial customers.