Seal and Insulate Windows:

Defender Insulating Windows, created by The Plastic Factor, has been serving architects, builders, property managers and home owners with our patented interior energy saving window systems since 1979. They are an affordable, easy to install, interior insulating window system for both residential homes and commercial properties. They restrict heat and cold thermal transmission and save you money!

Our most popular, Defender 1 window inserts with our Super-Lock system is installed inside your window frame. Defender 2 with Super-Lock is a flush mount system for windows and doors without a recessed frame. The dead air space between Defender and your window allows for maximum, thermal money saving performance.

How to Order Defender Insulating Windows

1. Measure the windows you'd like to insulate.

2. Order your frames based on your measurements being sure to round up to ensure you have enough frame to wrap around the window.

3. Order your acrylic which we will cut to order based on your measurements. To save on freight charges, you can also pick up your acrylic locally.

4. You're done and on your way to a warmer, more comfortable, more cost efficient home!

5. Got Questions? Give us a call and we'll guide you through the process. Yes - real people will answer the phone. 203-908-3468