Thermo Tech has been in the window and door space since 1993 and the company is located in Sauk Rapids, Minnesota. The business manufactures and sells vinyl windows and doors (via local companies) in a number of states, including Wyoming, Illinois, Iowa, South Dakota, Minnesota, North Dakota, Wisconsin and Michigan. Thermo-Tech is owned by Harvey Building Products – a deal that went through in 2018. Browse below for Thermo Tech Windows reviews.
Company Rating: 7.0 out of 10
Price Point: 7.5 out of 10
Bottom Line: Probably worth a bid.
(Always collect 3 to 4 additional bids)
Bill — Site Editor
Thermo Tech Windows Reviews
Thermo Tech manufactures a number of vinyl window series and a single patio door. Their windows include the Slimline (entry level), Classic (new construction), Thermo-Fit (upgraded replacement) and their Energy Guard High Performance (premium vinyl window). In terms of ratings, let’s highlight their Energy Guard in the double hung.
Homeowners can expect a U-value of 0.19, air infiltration rating of .03, solar heat gain coefficient of 0.16, r value of 3.85, condensation resistance of 70, and visible light of 0.47. These are very impressive numbers. For additional information, check out what these window ratings mean here.
Thermo Tech Windows Warranty
The company provides a limited lifetime warranty that covers the frame, sash, components, and all hardware. Specifically, that they are defect free from any and all manufacturing defects. Also, the insulated glass unit carries a 20 year warranty and exterior laminates are warranted for just 10 Years. Lastly, this warranty cannot be transferred to a subsequent owner.
Window Pricing Comparison
Silverline Windows Cost: V1 $525 installed
Simonton Windows Cost: Daylight Max $700 installed
New South Windows Cost: iVantage $800 installed
Anlin Windows Cost: Panoramic $825 installed
Thermo Tech Cost: Energy Guard Series: $875 installed
Okna Windows Cost: $900 installed
Harvey Windows Cost: Majestic $925 installed
Thermo Tech Windows Reviews
Bill, thanks for replying so quickly to my previous email! Also, I received another quote today, which I am leaning towards as the best of the bunch in terms of the combination of price, product quality and installer, and was hoping you might be willing to review it. As a reminder, I live in Minnesota, and am replacing 14 double hung windows, and will also be getting a little exterior trim replaced, in addition to adding aluminum wrap around the window frames outside of my home. I had the bid from a local dealer who sold ThermoTech, but his bid was $21K, which is just too much for my limited budget.
My latest quote is from the Universal Windows Direct rep near me (stevethewindowguy.com), for 14 Unishield Plus double pane windows (relabled Polaris ThermalWeld window), for $15k w/ financing, with a $1k discount for paying all upfront which I’m leaning towards doing, for $14k total. Also, they do offer a triple pane as well. However, Steve believed given my home’s age, and the likelihood of relatively poor insulation in my walls, that triple pane might just be overkill anyway. Given his online reviews, and the sentiment I read into the comments from his customers, I do think he’s being honest in his recommendation.
From other quotes I previously sent to you, the one you liked best was for 14 Hayfield Vinyl Classics for $17k. The new quote for the Unishield’s at $14k feels better not only in price, but also the installer company has a longer history in market/in business with 17 years vs 2 years. I included all the prior quotes below for reference, too. Thanks for any additional guidance!
Colin – Homeowner – from 2025
[Site Editor’s Answer]
Colin, I really like this option! In fact, the Unishield Plus (really a Polaris ThermalWeld Plus) is a strong and well built unit and obviously the price point is great compared to your existing bids. So, if Steve is recommending you don’t spend more money on triple pane, then I would believe him as he would make his markup on that higher per window cost. Therefore, I think this is your best bet from the options that you’ve looked at thus far.
I always find it amazing that you have bids from $35K to $14K for the exact same job. By the way, the performance data on the ThermalWeld Plus series is superior to the Renewal fibrex series. Lastly, I do agree with you that the ThermoTech Windows cost quote is just too high. Very good product though.
Bill – Site Editor – from 2025
Energy Guard Series Price Quote
Bill, I’ve collected 5 quotes at your behest on 20 windows, most of them double hungs. So, the final two are these: Energy Guard Series at $18.5K on their premium window and the Wincore 7700 series at $16.8K. Additionally, I wondered what you thought the better play was between these two.
Donald – Homeowner – from 2024
Editor Reply
Donald, for me, the better play here is the Thermo Tech, makes a nice window, especially in the Energy Guard. Additionally, I think it offers the better value over the Wincore 7700 option.
Bill – Site Editor – from 2024
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