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RetroGreen Energy At RetroGreen Energy, our focus is on delivering measurable comfort, energy savings, and healthier indoor air for clients across Minnesota. As an insulation contractor specializing in residential, multi-unit, agricultural, industrial, and commercial projects, we combine expertise in building science with premium materials to solve problems like high utility bills, mold, and ice dams.

Our RetroFoam injection insulation effectively fills wall cavities without expanding destructively or requiring major demolition. This safe, hypoallergenic, biodegradable, and fire-resistant material is installed externally by removing a strip of siding. We also provide attic insulation services, starting with professional-grade air sealing to prevent costly leaks, followed by cellulose insulation tailored to Minnesotas climate. Using eco-friendly spray foam, our approach ensures your property remains comfortable and energy-efficient throughout the year.
Business details
  • Licensed
  • Insured
Highlights and features
  • BPI-certified energy audits in St. Cloud area
  • Comprehensive blower door air leakage testing
  • Infrared thermography reveals hidden heat loss
  • Room-by-room outdoor connection pressure analysis
  • Customized testing packages with detailed reports
  • Proven results backed by client testimonials
Payment methods
  • Cash
  • Debit cards
  • Credit cards
Services
Wall Insulation Our RetroFoam wall insulation service transforms outdated, inefficient walls into a modern thermal barrier. We inject foam into your walls with minimal disruption, achieving excellent energy savings and noise control. Unlike traditional materials, RetroFoam resists settling, pests, and moisture, giving you long-term performance, improved comfort, and a safer living environment in just one professional installation.
Attic Insulation RetroGreen Energy offers attic insulation solutions that solve comfort and efficiency problems at their source. We inspect and seal hidden air leaks, improve ventilation, and install advanced insulation materials. Our method ensures your home retains heat in winter and stays cooler in summer, creating a healthier, more energy-efficient living environment. We handle every attic with precision.
Energy Audits At RetroGreen Energy, we conduct professional energy audits utilizing ten specialized tests to analyze your homes thermal and air performance. Our BPI-certified analysts uncover areas of air leakage, insulation gaps, and ventilation problems. With clear infrared imaging and comprehensive reports, we help homeowners make informed decisions to improve comfort, efficiency, and long-term value.
Soundproofing RetroGreen Energys soundproofing service uses RetroFoam to address unwanted noise and enhance your comfort. We inject noise-reducing foam through small access points, avoiding major disruptions to your home or business. This efficient solution not only reduces sound transmission but also contributes to energy savings and better climate control throughout your space.
Reviews (30)
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Jason Lampel
May 01, 2025
These guys were great. Sales/quote was very thorough and informative, good communication and follow-through on rebate applications. As for install, the crew of 4 or 5 worked well together, showed up on time, answered my questions, knocked out my retrofoam install in 6 or 7 hours, did a respectable job cleaning up afterward, and I can't even tell which pieces of siding they removed.

Good work fellas!
Marian Kramer
Apr 04, 2025
Great experience with RetroGreen Energy! I would definitely recommend them to anyone looking to improve the insulation of their house/building.
Sandy Saline
Mar 21, 2025
Very pleased. The whole process was excellent. The crew was efficient and respectful of my property. The cleanup was far more than I expected. I recommend them without reservation!
Angie Einerson
Feb 15, 2025
Quite the operation, I loved that they were able to complete the (huge) job in one day.
Dennis Grabuski
Jan 24, 2025
The crew did great job! Once the project was complete what difference did it make! I would recommend Retrogreen Energy to anyone especially with older homes that have no insulation in the structure from roof to basement walls!
Ashley Suchomel
Jan 02, 2025
We hired Retrogreen Energy to complete a retro installation of foam insulation in our existing walls. We have an old house with orignal newspaper insulation that was just not cutting it to keep us warm in MN winters.

The consultation and installation process went very smoothly. The company took care of the available rebate paperwork which was great

The crew completing the installation was very professional and communicated well with me throughout the day. It took just over half a day to complete the work from arrival to completed cleanup. We have cedar shakes as siding, and after the installation, we could hardly tell the work had been done.
Marcus Tolbert
Nov 22, 2024
For insulating my old home's attic they were careful, thorough, cleaned up after the work was done, and finished everything in one day.
Rick Heyne
Nov 09, 2024
Very professional and conscientious. The customer service was friendly and informative. They were very thorough and seemed to take great pride in their work. The clean up was immaculate. I would recommend to anyone.
Nick Dunning
Oct 31, 2024
Very professional and knowledgeable. Answered all my questions. They finished everything in the time they said and didnt leave a mess behind. Will definitely be contacting them again next year to do my walls. Thanks again!
Susan Wasson
Sep 28, 2024
The difference after having RetroGreen insulate our home was dramatic. We could tell the same day that we could hear less outside noise, and our heating requirements dropped significantly. Worth every penny!!!
Crystal Shirley
Sep 20, 2024
Tony and Lupe did a great job insulating my crawl space. Nice guys. I'm anxious to see the difference it will make this winter.
Paul Joseph Greene
Aug 16, 2024
RetroGreen Energy is the best! 5 STARS is NOT ENOUGH!

We are so grateful for RetroGreen's commitment to excellent work, and to treating us with respect.

That started from the very first moment Don arrived for our estimate, and never stopped. He was knowledgable, thoughtful, and responsive even after we had made our final payment. The crew was professional, courteous, and businesslike throughout.

When we noticed a minor oversight, and brought it to their attention, in less than an hour we heard from a member of the team who scheduled a time to come out and make things right. And that's just what they did.

They even helped us with energy rebates that made it possible for us to afford this attic and sunroom insulation project.

We say again: 5 STARS is NOT ENOUGH!
Vern Voss
Apr 11, 2024
Excellent Service.
Chris had a large crew doing our attic crawl space. Several trucks and lots of equipment. They had to open up the roof to access this tight space. The crew removed the old crappy insulation, foamed in new for R-60, repaired the roof with matching shingles. They where finishing up as the rain came. Excellent timing guys.
I am glad the team was so well prepared and did good job of cleaning up. We can feel the difference in our home already.
Jennifer Posusta
Jan 09, 2024
The retro green guys did a spectacular job insulating our almost 100 year old house. Super professional and made the whole process super easy. Highly recommend if youre looking to have your house insulated!
Kit Johnson
Dec 28, 2023
Got my garage insulation project done quickly and did a great job - and I can tell the insulation is working well! I hear my heater running a lot less already, despite the weather the last few days. Great work!
Joe Metzger
Dec 10, 2023
Great experience with Retro Green! I have an historic home and they carefully removed the siding to drill holes and put it all back in place when they were finished and touched up the paint. Excellent communication from start to finish.
Kim Berndt
Jun 04, 2023
They did excellent work. They answered all my questions. I was surprised at how quickly the job was done. The crew that did the job were very professional. Our house was done in the beginning of January and I waited to leave a review so I could see how much money we are saving on our heating costs and I can say there has definitely been a savings there. I only regret not having this done sooner.
Northland Steam Cleaners
May 20, 2023
The team at Retro Green did a fantastic job on our house. They showed up when they said they would, left our place clean, were very responsive and professional. We would highly recommend!
Janel Weinkauf Yasgar
Mar 07, 2023
We are very happy that Retro Green was able to help us with our Insulation in our Roof/attic and our exterior walls.
Having an older home, things were not as they should have been. Lack of insulation as well as lack of venting in the attic caused many issues. Having very little insulation in the walls as well, made for a cold house in the winter and hot in the summer!! The furnace and fireplace seemed to never shut off and the AC was the same!!
I highly recommend them as they are very easy to work with and the guys that do the work are very professional. Any question I had, they answered without any hesitation. They know their stuff!!
We are excited to see our propane bill be lower this year!!
Eric Larson
Feb 27, 2023
RetroGreen made two visits for our project. The first was to remove all the existing insulation in our attic in preparation for replacing HVAC ductwork. The second was to spray foam the new ductwork and seal gaps where it penetrated walls and floors. Foaming took place in the attic, main level and a crawl.

At each visit the crews showed up exactly on time. They confirmed the work to be done and asked multiple times if we had any questions before starting. They were good humored and engaging which is a monster plus for me. They worked efficiently and quickly. The finished work is better than we expected.

5 Stars!!
Dick Taylor
Feb 23, 2023
I had RertroGreen remove and reinstall attic insulation in our 25 year old house as it was apparent what was in there, wasn't doing the job. Our furnace ran constantly when temperature got below 10 F, and we had 5 foot icicles growing off the roof, even when temperatures were below freezing. Ergo, there was a massive heat loss. RetroGreen came in and in the space of 2 days, removed the old insulation, sealed and wrapped anything that needed it, (which was a lot!) and replaced it with new insulation. This was impressive to me as this is a large attic 3000+ sq.ft..
While it has been less than a week since they finished their work and I should actually give it more time before I make any permanent judgements, I can state at this time that during the recent snowstorm and subsequent sub-zero temperatures, the house stayed warm and draft free and the furnace spent more time off than on!
I am very happy with the results. There was a 30% reduction in air loss after the insulation was installed.
Jed Uhlenkamp
Feb 21, 2023
We hired RetroGreen Energy to help us come up with a sound proofing plan for a spin studio in a busy office complex. We executed the plan and the final results were better than we anticipated. We have zero transfer of sound out of the workout rooms, even when the stereo system is turned all the way up. We will defiantly be using RetroGeen Energy again in the future! Thank you for your great work.
Paul Udstrand
Dec 20, 2022
We used RetroGreen to replace attic insulation and inject insulation into our bedroom walls. The entire crew was friendly, courteous, and extremely willing to answer any questions. They arrived on time and finished in a few hours. Everything from the dumpster delivery to the arrival of the crew was on time as scheduled. The quality of the work is outstanding. I would recommend RetroGreen to anyone looking for insulation installers.
Bret Hepola
Dec 03, 2022
As a business owner in the service industry, I was overly impressed with the amount of effort they took to protect the entire house. The entire crew worked their tails off. Nick, the foreman was hands down amazing and answered all of my questions.. Communicative, responsive and a pleasure to work with. Not only did the protection of the house amaze me, the clean-up was just as good. I highly recommend this crew!
Joel Johnson
May 08, 2022
Due to a cancellation I was able to get the install months before scheduled. The crew was fast, efficient and swore like sailors. The insulation effect was noticeable the first day with the main floor not as cold and the floor didn't have the usual cold spots.
Communication on what the job entailed and when it was to begin was well communicated before install day.
Mike Wegner
Nov 18, 2021
We had Retro Green come and insulate our home the was built in the late 60's. They where very reasonable and had a great product. I believe the house is less drafty and is much quieter! Their crew was friendly and hardworking! Thank you for a great job!!
Mike & Edee Conner
Nov 10, 2021
The crew led by Paul was on time and extremely responsive to my questions and concerns. The work they did, taking out the old attic insulation and replacing it with foam and blown in insulation was amazing. I am completely impressed by their workmanship and professionalism. My wife was excited with the cleanliness of the project. We would have to say JOB WELL DONE.
Andy Juelich
May 19, 2021
Fantastic group of people. From the sales team (Sam) explaining all aspects of the scope of work, with detailed photos and examples, to the team of installers that spent the time to explain the process and demonstrate how everything works. Paul (on site Supervisor) and his team (Andy, Jake and Vince) worked through some challenging conditions (rain and wind) without any concerns or complaints.

As a homeowner I wanted to ensure the team understood what my main concern was (drafty windows and doors), Paul spend additional time to discuss my main concerns with me and the team to ensure they were going to alleviate the issues I had. Paul, Andy, Jake and Vince were very professional while on site and prioritized their time to complete this project in the time they stated. This house was a bit of a challenge with previous renovations (the house was built in 1890) but Paul and the team worked with me to ensure we were able to achieve the intended outcome.

As a costumer I was very happy with the support and attention to detail that Paul and his crew preformed. I would highly recommend that anyone with insulating needs reach out to this group of devoted, determined, and highly skilled professionals. I'm very PROUD of the team and willing to answer any questions folks may have as I will continue to support this company.

And yes I'm a real person. Please see attached picture of the project.
Annette Mills
Mar 22, 2020
We contacted Home Advisors who gave us 3 companies to contact for adding insulation to our home. RetroGreen had their "act" together and after doing an energy audit of our house, Paul pointed out the areas where we were lacking sufficient insulation and air leaks. Sam came and took the measurements and gave us a quote. We had to wait longer than we liked to have the work done but have found out that the busy contractors are usually the ones that do the best job. Cody brought the crew in yesterday (half hour earlier than we were told). They went right to work and vacuumed out the old insulation and sealed the areas that leaked, built boxes around fixtures that stuck up into attic. and made a frame around ladder going into attic. Then they sprayed R-60 cellulose insulation into attic, making sure the ventilation needed was there. They cleaned the work area up including the ladder. I highly recommend RetroGreenEnergy
Kathy Kamrud
Jun 19, 2017
Sam gave a great presentation of who RetroGreen Energy is and he told us about the products, about the process, how long it will take, the clean up.
Day of installation: the dumpster arrived on time, the crew arrived on time, they started working right away, finished by mid afternoon and cleaned up after themselves. Very impressive.
They even do the paperwork for any Rebates that might be in place from the City, I just received my Rebate. All in all, it took less than a month.

So for my house, it was built in 1879, for the 16 years I have been here, I can tell you my furnace never shut off when it was below 20degrees outside and my heat never rose above 61degrees. After RetroGreen Energy did their magic, my furnace shuts off, (for quite a bit of time) and my house stays warm. Extremely happy. I highly recommend them.

Follow up, they send you pictures of what was in my wall spaces and attic space, I wasn't surprised, there was nothing. Also the"finished" pictures. I am so very happy to have run into them at a booth at the Sportsman Show.
A Very BIG Thank You to RetroGreen Energy,

Kathy
St. Paul