We've blogged about a bubble wrap “stained glass window” before, but bubble wrap also works as a great insulator when it's cold. ... As an alternative to insulating shades, bubble wrap provides a pocket of air to prevent cold and heat from moving in and out of your home.

Does bubble wrap insulate well?

Insulate Windows

Those tiny bubbles of air in bubble wrap have insulating properties. Put this ability to good use by lining drafty windows with bubble wrap in the winter to keep the room warmer.

Is bubble wrap a good insulator to keep things cold?

Bubble wrap works as an insulator by keeping heat away from cold items. So technically, bubble wrap shields shield things from heat rather than keeping the cold in, but never mind the technicalities. Bubble wrap still does an excellent job of controlling and regulating temperature. What is this?