Rated 5 out of 5 stars based on 114 customer reviews.

The customer service is outstanding. We were having drafts in certain places around our house. After the retrofoam was put in, the drafts & cold areas are gone. An added plus, is the traffic on our street is less noticeable. The sales person who called to the 3 men doing the installing were excellent in their respective jobs. We highly recommend their workmanship. They are a WE energies/Focus on Energy approved and Veteran owned company. - 9/08/2024 

Alex and his crew arrived on time, even called before they were leaving the shop to confirm the scheduled appointment and give me an ETA. They were unloaded and working on my house within 30 minutes. Alex answered all my questions on the project. They did a wonderful job cleaning up after the work was completed. They were very polite and professional. Completed the job in a timely manner. Would also like to add from start to finish everything went flawless. From the first contact with the receptionist, setting up the estimate. Having the estimate done and explaining the process they do, to the work performed. Guy Miller Mosinee WI - 9/07/2024 

I was very impressed with the work done by Mammoth Home Renovations crew, and believe me, they had their work cut out for them. I had a great crew who tackled every issue that arose without a hitch, and the finished product is beautiful! - 7/27/2024 

Very professional company. Completely satisfied with the job they did. We would highly recommend Retrofoam to anyone looking to insulate their home. Thank you for your excellent service. - 6/12/2024 

Ended up having to do two sessions but i was very pleased with the finished product. The owner of the company made sure I was satisfied with the project and also was flexible with my schedule. I will be using them for future projects. - 2/29/2024 

Had retrofoam being done in my 1880 home with attic insulation happening next week. Every estimate was broken down neatly with various options talked about. Pricing was clear and, while certainly not price-first, came in around the expected project cost for a far better result than I expected. Crew was respectful and kind, even when my ancient wood paneling had a blowout, causing a large mess in my living room. They cleaned any foam entrance into the home and fixed the wood board. It looks brand new and my entire home is already more comfortable and quieter. Definitely recommend Fox Cities Retrofoam for older homes with little to no insulation!! Very excited to have the attic done next week! - 2/23/2024 

It is very nerve racking to make a decision on a product that you know you need but questioning yourself as to did I make the right decision. Their Employees are the face of this Company. They represent this Company with pride. From start to finish they included me through the whole process. They did wonderful work! I am here to tell you this is the Company to take care of your home! - 12/04/2023 

Very, very, very AWESOME/EXCELLENTjob completed by Jon J, Zack, Nick, Alex & Jon!!! They were very thorough with the whole process & did an excellent clean up job!! We could notice a difference in the household climate almost immediately !!!! I would highly recommend Fox Cities Retro Foam to get the job done!!!!!!! Brad & Dianne Detert - 12/04/2023 

What a difference in the comfort of my home. Team was friendly and professional! Would highly recommend! - 12/04/2023 

We had whole home insulation done and immediately saw our electric bill drop. We are easily saving over $130 a month on our energy bill. The guys who came to do the work were friendly and respectful. They did a great job and we could not be happier. It also keeps our water pipes warmer so it takes much less time to get hot water to the shower on the second floor. We love it. - 12/04/2023