One Company,
One Solution

AT Klemens was founded as a sheet metal shop in 1928. From this heating, ventilating, and air conditioning beginning, we have grown and expanded through the years. The addition of roofing, service, plumbing, and electrical departments has made AT Klemens a multi-service company. Our ability to perform as a prime contractor or as a one-source subcontractor, responsible for the coordination of several crafts, has been a substantial benefit to our customers.



Customer satisfaction has been the foundation of our growth since 1928
and will continue to be the basis upon which our present and future goals are predicted.


from our clients


I have had the pleasure to work with AT Klemens on a professional level. As a licensed Property Manager, we manage several properties throughout Great Falls. The AT Klemens team is always responsive and professional-even at 2am in a snow storm to fix a broken furnace (it's always in the middle of winter in the middle of the night-murpheys law!) Their dispatch team is always professional to interact with and their technicians are wonderful! They always get our rentals back up and running quickly and with the utmost experience and care so our residents are cared for with little inconvenience as possible.

MAC Family Ventures

Before I found AT Klemens I contacted several other companies and was left disappointed when they didn't show up for their appointment or never provided a quote after showing up. When I contacted AT Klemens they showed up on time, provided a reasonable quote and executed the job quickly. I've had them out to install a boiler heater, gas pipe for a stove and troubleshoot my HVAC. AT Klemens is my only call for any future work.

Jacob S.

Highly recommend them. I had Justin come out and help me troubleshoot electrical in my house and he was very thorough and took the time to explain what he was doing. Was able to show up early and was easy to talk to and professional the whole time. I won’t use another company after them!

Patricia R.

Just wanted to recommend AT Klemens and their plumbing shop, especially. The guys were friendly, professional, cleaned up the messes, and always polite. You want the job done correctly, whether plumbing, electrical, heating, A/C -- just call the people at AT Klemens. Kari, their scheduler is always happy to help -- not much waiting required for services needed. Thanks, AT Klemens!