For all your Windsor HVAC, furnace, water heater and air conditioning repair and installation services, come visit the experts of Red Line Mechanical, LLC. Our team has over 30 years of experience in the industry, and with quality customer service and safety being our top priorities, it’s no wonder why our Northern Colorado customers chose us every time. We only work with top manufactures so we can guarantee our Greeley HVAC, furnace, water heater and air conditioning installations and repairs are done with some of the best materials. Our technicians are also held to the highest standards in the industry. We provide them with ongoing trainings, so they are always up to date on technology and product regulations.

  • Windsor Furnaces

    Windsor Furnaces

    Furnaces – We offer annual furnace maintenance and installation services to all our customers. Colorado is known for their random spring storms, so be prepared for the snow with a visit from Red Line. We provide a free filter service with every inspection or installation.

  • Windsor Water Heaters

    Windsor Water Heaters

    Water Heaters – Need a new water heater, or just want to schedule some routine maintenance? We can help! We will make sure your water is always running hot, and we offer a quote with every inspection or repair request.

  • Windsor Humidifiers

    Windsor Humidifiers

    Humidifiers – When you need a new humidifier, or you want to have routine maintenance performed, Red Line can make sure everything is running the way it needs to be and that your home is retaining the right amount of moisture. We also offer a complimentary filter service with all repairs and installation visits.



Red Line Mechanical, LLC in Windsor is known for our reliable HVAC, furnace, water heater and air conditioning repair and installations. Our customers will always receive trustworthy and dependable work from the team of experts at Red Line. We make safety our number one priority with customer satisfaction coming in next. Our specialists are ready to help you with your next project.



We have been serving Windsor for many years and are a trusted source for all types of HVAC installation and repair.


We only work with the highest rated manufacturers in the industry and guarantee all of our Redline Heating, furnace, and water heater service, repair, installation and replacement work.


We hold our Redline Technicians to the highest possible industry standards. We provide ongoing training for our techs to make sure they are up to date with the latest industry knowledge.


Redline Heating offers repair and replacement services for heating, AC systems, furnaces, water heaters, and more throughout Windsor and Northern Colorado. We provide FREE quotes for all service types.


*Call today to find out about our warranty information.


We provide everything you need to repair or replace your HVAC system. We have the equipment, industry knowledge and trained technicians to get the job done right.


We have been repairing, installing, and replacing air Conditioners, furnaces, water heaters and humidifiers in the Windsor area for over 30 years and we take pride in what we do.




  • I am a member of their service plan and pay $19/month for their ongoing routine inspections and service. As a member, the cost savings I get for almost any repairs or service is almost enough to cover the monthly fees. They come out every three month and spend at least an hour checking and servicing my furnace and air conditioner including replacing the air filter.

    Elliot A.
  • Heater broke on a Saturday and they saved the day! Being new to the area I had not needed this service before but I will defiantly be calling them again for all my needs. Their prompt and professional service was exceptional!! Really enjoyed doing business with them (especially the manager who did the service call) even though it was not a desire predicament. Highly recommended!!

    Richard P.
  • Friendly people and great service. Not a single bad experience in the last 4 years of business relationship.

    Dan S.
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