solar thermal

Solar Thermal Design and Installation

  • Captures heat from the sun year round

  • Can provide a family of 4 up to 80% of domestic hot water and up to 60% home heating

  • Eligible for 30% Federal tax credit

  • Solar hot water tanks are super-insulated and can loose as little as a degree per day

  • Added value to the home, property, business

  • Proven technology, simple and affordable

  • To serve your hot water needs - laundry, showers, baths, hot tubs, pools, home heating

  • Installs typically and conveniently in several days

Solar Thermal Maintenance and Repair

A properly installed and maintained solar water heating system should last for many years. Many of the system components such as the pump, expansion tank, and motorized valves should last about 20 years. However, even the most carefully designed systems will develop problems due to failing and fatigued parts. Diligent monitoring of your system can prevent high cost repair/replacement and catastrophic failures.

A key component to a proper functioning solar thermal system in our Minnesota climate is the glycol used to prevent freezing in the winter months. The glycol quality and operation in your system should be checked by a solar thermal technician every 5 to 10 years. While visiting to insure glycol quality, the technician shall also note other problems or potential problems. System pressure shall be reported and noted with the last set pressure. System piping and mechanical joints should be checked for leaks. Piping insulation and insulation protection should be checked both interior and exterior for any loose or missing parts. Moving parts should be checked for smooth operation. Air vents and expansion tanks should be checked for proper operation and satisfactory pressure.

Solar Thermal Expert- Tim Pendergast

Tim Pendergast has been directly involved in the installation and repair of solar energy systems in Minnesota for the past 15 years. He has an educational background in renewable energy, and his professional background is in construction and building inspection. He has completed the NABCEP certification process and was a trusted expert who assisted in the creation of the NABCEP exam requirements. Tim is one of the premier experts in the Solar Thermal Technology industry in the mid-west. Having been directly involved in the installation, repair and maintenance of over 3,000 square feet of solar thermal paneled systems, Tim is your go to resource for all of your solar thermal needs.


  • Outstanding local community business specializing in green energy and energy efficiency. Can't recommend them enough.

    ★ ★ ★ ★ ★



    Outstanding local community business specializing in green energy and energy efficiency. Can't recommend them enough.

    ★ ★ ★ ★ ★


    ★ ★ ★ ★ ★
    David Zaffrann
  • Great guys! Excellent at community support and honest.


    ★ ★ ★ ★ ★

    Great guys! Excellent at community support and honest.


    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Laura Cina
  • Fantastic site. High quality work. If you want energy efficient improvements to your home, you have found the site.


    ★ ★ ★ ★ ★

    Fantastic site. High quality work. If you want energy efficient improvements to your home, you have found the site.


    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Bruce Swanson
  • Brought a 1913 house up to modern insulation standards with spray foam and blown cellulose. They were very responsive to my feedback. Would work with them again.

    ★ ★ ★ ★ ★

    Brought a 1913 house up to modern insulation standards with spray foam and blown cellulose. They were very responsive to my feedback. Would work with them again.

    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Happy Client
  • AEI is wonderful to work with, this is my 3rd project with them (insulation and bathroom remodel done previously.) Brayden is responsive and easy to work with. Any issues that arrose we're taken care of with alacrity. Chris did amazing work (my kitchen started out looking like a 50's throwback and now looks like it belongs in this decade!) and made sure we were happy every step of the way. Highly recommend!

    ★ ★ ★ ★ ★

    AEI is wonderful to work with, this is my 3rd project with them (insulation and bathroom remodel done previously.) Brayden is responsive and easy to work with. Any issues that arrose we're taken care of with alacrity. Chris did amazing work (my kitchen started out looking like a 50's throwback and now looks like it belongs in this decade!) and made sure we were happy every step of the way. Highly recommend!

    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Happy Client
  • The crew arrived promptly at 8:00 and the installation and clean up were finished by noon.

    ★ ★ ★ ★ ★

    The crew arrived promptly at 8:00 and the installation and clean up were finished by noon.

    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Happy Client
  • All our AEI jobs were done in a professional manner, on-time, and extremely quality work. I will use them for further projects and would highly recommend them to friends and family.

    ★ ★ ★ ★ ★

    All our AEI jobs were done in a professional manner, on-time, and extremely quality work. I will use them for further projects and would highly recommend them to friends and family.

    ★ ★ ★ ★ ★

    ★ ★ ★ ★ ★
    Happy Client