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"Lee's team of insulation specialists did a phenomenal job of spray foam insulating a very, very small crawl space in our home (as well as some boxsills). We have had several construction professionals in our home recently, as we are considering a major renovation to our house, and they have all commented on how well done the job is, and how amazed they are that insulation specialists were able to access such a small space. The team arrived on time, did their work quickly, and the administrative team was very communicative, personable, and kind. We'd highly recommend Duerst to others!"

"Joe did the original sale, install (2004), and maintenance. Joe was very knowledgeable about heat pumps and did a nice job with the sale. After a few years it wasn't putting out heat like it did when new. Van's came out quickly and diagnosed a failing compressor. WaterFurnace and Van's replaced it under warranty at NO charge to me. Now Tom owns the business. In Dec of 2021 we had problems with the WF, called at 8:05am in the morning and two techs were at our house in Shawano by 10:30am. Diagnosed the problem and fixed it. Reasonable trip and service call charges. Highly recommend."

"I had issues with my furnace in November. A technician came out and gave me a quote for $750 (Similar to another complaint filed). Needing a replacement part to be ordered. I had to wait a day for it to arrive and use space heaters. The technician came over then installed the new part. However, later in the evening it would not heat again. So I called and did some investigating. I found out that a full replacement cost of my furnace would be $750. When I confronted the owner about my problem happening again and my finding. He said that he would send the technician back the next day at no charge to me because, "We stand by our work." The technician came back and replaced another $10 or so part that was cleaned some of the interior of the furnace. It started to work again. I was then promptly invoiced the $750 with no itemization (Shady) on it of any kind. I paid it and had heat for the next 3 months. Then out of the blue, Anderson sent me another $470 again non itemized invoice 3 months later, retro dated for 3 months back (Super Shady). I called them up refusing to pay it asking why after 3 months I was being billed again. The owner then stated, "They were behind in billing," (A clear lie, since I was billed promptly the first time), then lectured me about how business works and that the cost "was reasonable"(Even after going back on his word - Lying/Unethical), and essentially said I should be grateful I had heat the last few months, I hung up on them. He then sent a itemized invoice of of $200 after I said I was going to report him to the BBB with an email back in response to the $470 non itemized invoice. Shortly after this, I started to have issues again. Where it was starting to overheat resulting in me smelling smoke. Which is how I discovered what was happening. However, I think the overheating may have caused more damage to the furnace resulting in me to have to have another service to come in and inspect it out of concern for my own safety and because it is once again having issues with reaching set temperature. It will either greatly exceed or remain steady under set temperature. Photos have been taken, the item causing the burning smell found and saved, screenshots of the other negative review taken, and the BBB and Consumer Reports will now be contacted. DON"T USE THIS BUSINESS."