4.6 
161 *The Angi rating for Window Service companies in Cos Cob, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
*The HomeAdvisor rating for Window Service companies in Cos Cob, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
Last update on November 17, 2025
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1996
Free estimates
Warranties offered
"Gary and his crew replaced 22 windows for us in one day on our 1969 colonial. They did a great job and I would hire them again."
+45
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1985
Free estimates
Emergency services offered
"Great experience from beginning to end. Aaron the sales and service representative was professional, knowledgeable and attentive. The window quality is excellent. The installation was seamless they were on time and all business. They paid attention to details and the clean up at the end was fantastic. It was a pleasure all around I highly recommend Thermo Seal."
+29
Serving Cos Cob, CT and surrounding areas
Approved (Corporate)
In business since 1992
Free estimates
Warranties offered
"The guy did an excellent job. I have no complaints. This was our 2nd window project and we really liked the windows we did 6 years ago so finished off the house."
+41
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1970
Free estimates
Offers commercial services
"Thanks Jesse and Vince for getting our window fixed so quickly."
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1984
Free estimates
Emergency services offered
"Jay replaced several torn window screens. Great customer service & wonderful job."
+7
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1961
Free estimates
Credit card accepted
"Install crew was perfect. No dust, no mess. Complete cleanup, and a perfect airtight install. For years we have had winter management strategies. Closing off room on the north side... and running space heater in those rooms during use. After installation of the ProEdge windows these rooms are as warm as the rest of the house. AMAZING! Recent warm days prove the advantage of triple glazed low-E windows, too. Nice and cool inside. I searched for years for new windows that met MY specifications . As a career engineer I am happy to recommend ProEdge to anyone. Their attention to detail is superb."
+38
Serving Cos Cob, CT and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Offers commercial services
Customers say: Terrific value
"Clear description of work. Stuck to schedule and did a great job cleaning the windows."
Serving Cos Cob, CT and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Worked with Guncay Glass & Mirror several times with Satisfactory results and professionalism in each project. Well priced and always on time, will keep using them over and over."
+37
Serving Cos Cob, CT and surrounding areas
Approved (Corporate)
In business since 2000
Free estimates
Warranties offered
"I have to say that Matt, Dave and Rich were amazing! They were professional, friendly and cleaned up after themselves! I will tell anyone I know looking for windows to call Rite Window for sure. Happy customer Darlene"
+55
Serving Cos Cob, CT and surrounding areas
Approved
In business since 2001
Free estimates
Credit card accepted
"Carlos was very great to work with. Was flexible with scheduling and did impeccable work. My windows are spotless! He was also able to have the entire interior of the house cleaned. Highly recommend Carlos for both window cleaning and interior cleaning services."
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