The Pella ThermaStar is part of the Replacement Windows test program at Consumer Reports. In our lab tests, Double-hung window models like the ThermaStar are rated on multiple criteria ...

Unlock to see our ratings and compare products side by side Wind resistance measures each window's ability to prevent drafts with 25 and 50 mph winds and an outdoor temperatures of 0ºF.

Our editors also may be in touch with follow-up questions. Pella is a longstanding manufacturer of windows and doors in North America. Based on our research, we awarded Pella a score of 4.4 out of ...