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We at RetroGreen Energy are committed to making Minnesota homes and buildings more comfortable, efficient, and healthy through professional insulation services. Specializing in residential, multi-unit, agricultural, industrial, and commercial projects, we apply advanced building science to solve problems like high utility bills, poor air quality, and ice dams.

Our RetroFoam injection insulation is designed to fill wall cavities completely without expanding or requiring demolition, making it a safe, biodegradable, fire-resistant, and hypoallergenic choice. This external installation method minimizes disruption while delivering maximum benefit. In attics, we perform meticulous air sealing with environmentally friendly spray foam, then install cellulose insulation to meet or exceed recommended R-values. These solutions work together to enhance comfort, reduce costs, and improve the overall indoor environment.

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 RetroGreen Energy provides expert wall insulation services with RetroFoam, the industrys leading injection foam for existing homes. Our team carefully installs the foam through siding or minimal drilling, ensuring full cavity coverage and preserving your homes appearance. This safe, odorless material improves energy efficiency, soundproofing, and fire safety, all while maintaining the structural integrity of your walls.
Attic Insulation We specialize in providing attic insulation systems that address the root causes of energy loss and discomfort. Every home receives a thorough inspection, customized thermal envelope design, and expert installation of air sealing and insulation materials. Our process ensures your attic supports the efficiency and durability of your entire home, reducing costs and improving livability.
Energy Audits RetroGreen Energy specializes in complete energy audits to measure and analyze your homes efficiency. We perform in-depth building science-based testing, including air leakage detection, heat loss analysis, and pressure diagnostics. Our certified technicians deliver detailed reports that highlight problem areas and suggest targeted solutions to enhance your homes comfort and reduce energy costs.
Soundproofing RetroGreen Energy offers soundproofing that effectively reduces noise from both inside and outside your building. We utilize RetroFoam insulation, injected cleanly into walls, ceilings, and floors, to dampen sound and enhance comfort. This non-invasive process is quick and efficient, with the added benefit of improving your buildings energy performance and lowering utility costs.
Reviews (30)
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Kirk Kandler
Jun 09, 2025
Highly recommend RetroGreen for quality of communication, timeliness, professionalism, and cleanliness.
They told us exactly which 2 days they would be at our place, brought a large crew those 2 days, and blew foam into our attic, walls, and crawl space. They were exceedingly polite, and cleaned up very very well afterwards.
Both days were rainy and muddy, so the hoses dragged mud inside, but they had dropped plastic and cardboard throughout the interior. Even covered appliances. With all the mud and rain, we expected to come out to quite a mess, but they cleaned and wiped every surface.

The a/c is running 1/2 as often to cool the house as prior to installation, so work was obviously effective as well.

Quality work by quality people
Theresa Frericks
Jun 02, 2025
The experience I had with Retro Green was awesome. I had a lot of questions about the process and they were very knowledgeable and patient. Thanks Drew and Don!! Great guys that came out to do the install and they cleaned up very well. I have noticed a difference already in my lake cabin. Thanks again Retro Green.
Diana Nelson
May 25, 2025
I had expanding foam insulation installed in the walls of my 1954 house by RetroGreen of St. Cloud. (Although the blown in attic insulation I had hired 5 years prior helped utility costs tremendously, the old wall batting was making little difference in heat retention.Or keeping cool.The new furnace ran often.)
A great 3 man crew arrived on time; they were polite, got along well, worked efficiently, and clean up was like " they had never been there." My foundation plants survived very well and were treated with care. The double dutch lap siding was handled expertly.
Exterior sound from the neighborhood was reduced immediately. There's little doubt in my mind that propane and electricity usage will be reduced. It feels even more of a sweet, cozy little house now.
You have a great crew , Chris. Thank you for the thorough coverage of information and quote early on.I appreciate the immediate rebate application form being taken care of,too, Lupe.
Melessa Jungles
Apr 26, 2025
Great work, great crew, came early, cleaned up after themselves. I can already tell a difference and the sound barrier is amazing! 80% proof! Can't wait to see what it does for the energy bills!
L. K.
Apr 08, 2025
Great crew - great work! Professional and reliable from bid to finished job. I had a really rough start trying to find a local company that would show up to look and actually provide straight answers and a solid bid. It was overwhelming and stressful.
From the moment Retrogreen took my first phone call, the stress was gone. The crew was great, my house is finally cozy.
From their general expertise, to the excellent customer service and fantastic work, I cannot recommend this company enough.
Angie Einerson
Feb 15, 2025
Quite the operation, I loved that they were able to complete the (huge) job in one day.
Laurie Yahn
Jan 03, 2025
Great job insulating my house. It was a big job, and employees completed the job in a very timely manner. Very polite and courteous, cleaned up after the job was completed; very nice job. I was very pleased with the process.
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.
Cole Mayer
Oct 03, 2024
Very professional group. Not pushy in selling me a project. Understood my needs and are complete experts when it comes to older homes and insulations. Felt comfortable working with them from day one of getting quote. Top notch group.
Haley Tsuji
Sep 25, 2024
RetroGreen was great to work with! After coming to them with concerns about temperature fluctuations in our 2nd floor, they were quickly able to identify the problem (literally no insulation), and come back with a quote. They were able to fit us in quickly after receiving the down payment and clearly laid out all the tax and rebates available to us. Were very happy with the work and are excited to not freeze this winter!
Elizabeth Carlson
Sep 05, 2024
From start to finish, the RetroGreen team was great to work with. Quality people, quality communication, and quality service with very little disruption to our 100 year old house.
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!
Kara Newman
Jun 10, 2024
RetroGreen did a nice job insulating my attic with spray foam. Both the sales team and installation team were easy to work with. I would definitely hire them again.
Scott Hemink
Jun 09, 2024
Great experience and extremely professional crew! They insulated the attic spaces in our 1 1/2 story house. This reduced our air leakage by 38% Seriously! Executed a combination of foams and blown fill exactly as planned, arrived and completed on schedule, and kept everything extremely clean! Even sent me pictures of the final installation for my records! I wish all my contractors were this professional!
Barbara Chirinos
Apr 24, 2024
Everyone associated with this project was professional and pleasant from the owner who provided the initial overview and quote to the crew who worked in the hottest weather of the summer to complete my project on time. It was a sizable investment in my 1949 home. I immediately noticed the reduction in outside noise and an improvement on what was a drastic difference in temperatures between main level and second story.
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.
Steph Stenlund
Apr 01, 2024
Great experience! Nick and crew were professional and courteous. They arrived when promised, and promptly went to work! They cleaned up perfectly, to the point where it didnt even look like anyone had taken off siding, etc. I already notice the difference in less sound coming through the walls, and heat staying in. Thank you, to RetroGreen!
Kelly Tuttle
Feb 23, 2024
We had insulation installed in the ceiling of our loft space. Work had to be done from the inside. Everything was great! Good communication, good crew, timely, efficient, neat worksite, cleaned up at end. We've noticed an improvement already in the energy conservation upstairs. Highly recommend.
Dick Olson
Feb 03, 2024
The guys did a great job, very considerate of the flowers and plants we had around the house, did a great job of cleaning up after they were done, asked if we had any questions, did a walk around after they completed the job, very pleased with the work.
Nathan Niblick
Nov 24, 2023
I couldnt be happier. By far the most knowledgeable and professional salesperson and installers of any that quoted me. I see why they have such a great reputation in the industry. I would 100% recommend them for any of your insulation needs.
Lisa Berg
Nov 18, 2023
Chris and the crew that insulated my attic were very knowledgeable, friendly and professional. They squeezed me in so I wouldn't have to be without insulation into the hot summer months and handled all the paperwork to get my energy rebates. It was a very seamless and easy process.
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!
Tom Eggleston
Apr 12, 2023
Super professional and very knowledgeable. The whole process was awesome from the quote to the job getting done. The crew even left the house cleaner then it was when the got here. Can already tell the difference in air quality and my home is much more comfortable already. Definitely would call these guys with future projects
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!!
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!
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.
Clay Bennett
Feb 24, 2017
The company representative at the home improvement trade show was knowledgeable and easy-going, which made it easier to ask for a home visit. The scheduler and estimator were friendly and responsive, and gave straight answers quickly. And the crew was best of all: punctual, professional, personable, and thorough. From first meeting to completed project was less than a month, and I'm very happy with the results.
Nola Zane
Mar 12, 2016
Our experience was very good. The salesman was experienced and knowledgeable. The employees on the job were polite and efficient. It took about five hours, less than we thought. Before the job started our attic was rated R16, after R60. And the blower test before and after was impressive. We have a vaulted ceiling in the living room and dining room. Another company we contacted wasn't interested in insulating the vault but no problem for RetroGreen. We recommend the company.