Sales, Service and Installation

Residential and Commercial

All Season Heating & Air Conditioning, LLC is a family-owned HVAC company. We have been in business in the Helena area since 1984 and in 2010 we opened our doors in Shelby, Montana. We have a great team of local technicians ready to serve the Hi-Line area, managed by Peder Underdal.

Our employees are experienced, trustworthy, and honest tradesmen. We are ready to meet your needs in a timely professional manner, to your satisfaction, and at a fair price. We offer free estimates for new construction and replacement of older equipment. We also offer a Preventive Maintenance Program which gives you the benefit of regular inspections on your furnace and air conditioner, and the peace of mind that comes from spotting potential problems before they cause trouble.

Please consider our service, installation, equipment replacement, and indoor air quality improvement products the next time you have a need for your residential or commercial building. We are a fully insured Premier Lennox Dealer and our Contractor Registration number is 150921.

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What Our Friends Say

  • I would also like to take this opportunity to let you know the two young men who installed my furnace were very competent, polite, and nice to work with. Kudos to them!


  • Thank you so very much for getting us in. What a wonderful surprise to come home and find it done! You’re a Prince!!

    Bob & Jeanne

  • Thank you – Works great – Seems like a new home. πŸ™‚ Great service and prompt crew made everything go smooth.

    Bob & Bonnie

  • Enclosed is a check to pay for the furnace and the install. Overall I am very happy with it all and have recommended you to a few people.


  • Thank you so much for your weekend furnace call. Now, during these cold days, I’m not afraid. Merry Christmas and thank you again.

    I will use your business for all heating and AC work – and tell everyone I know to use you too.


  • We love our new heating system (especially with the new snow) and we wanted to say “Thanks” again. Your team was very respectful of our house and did such nice finishing work. We are very happy and impressed. Thank again for answering our questions and addressing our concerns.

    Kelly, Jamie, Alma

  • Thank you for your support of CHS and HHS Golf! Without your generosity we could not compete with other AA schools around the state. Thank you!

    CHS Golf Team

  • Thanks so much for your prompt & efficient service


  • Thank you very much for your great service! I greatly appreciate it. Thanks again


  • Thank you so much for your quick service.


  • Thank you!


  • Thank you so much! The gentleman who fixed our furnace was very courteous and efficient!

    Planet Beach

  • Thank you for doing such a good job! We’re very impressed, no mess, works great and we’ll highly recommend All Seasons. Thanks again!


  • I just wanted to say that we really like our new air conditioner – it works great. Also I wanted to let you know that your service guys that installed our air conditioner were very professional, courteous, and nice to work with. I apologize I cannot remember their names so if you could let them know we were very impressed.


  • Coming back from a 24-hour flight from Asia to learn that “your furnace isn’t working” is not the best welcome home message to receive. I would like to thank you for keeping my old furnace operational while ordering me a new on eand then installing it so rapidly. Now that this really cold weather has hit, I am eternally grateful to have a consistent source of heat.

    Secondly, I would like to say that the 3 guys you sent over to install my furnace last week could not have been nicer. First thing they did was to knock the snow off their boots before entering my house. They put tarps down and vacuumed when they finished and actually left the place in better shape than when they arrived.


  • Thanks a bunch! It’s so nice to have AC now – We’ll be sleeping well this summer πŸ™‚ Thanks for the nice service.


  • The two gentlemen who installed our AC were/are the nicest & politest technicians that we’ve ever had in our home! You should be proud of them.


  • Thank you so much for all your dedication and hard work! πŸ™‚ We are very pleased with our new furnace! Also I would like to give a special thank you to the crew of guys that came our to install the furnace. They were very knowledgeable, hardworking and polite. Thanks a ton!


  • Thanks for all of your hard work!


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