Anyone have info on removable window film/clings?   I'd think there would be either interior or exterior mirrored reflective film/clings that you could use year to year for the summer.   That way you get the summer performance against heat gain, but also removable for winter for solar heat gain.    Anyone come across studies or products that fit this?

Static cling window film is really nothing more than colored vinyl with poor clarity and offers little more than minor glare reduction(like keeping the sun out of a child's eyes on a car window). An applied window film, bonded to the glass, can still be removed, if needed, but not reapplied. However there is a new answer to this dilemma. Solutia, the largest window film mfr. in the world, has developed a new technolgy film called Enerlogic, which is designed to offer both, summertime heat rejection and significant wintertime heat retention, making it the first year-round window film offering this high level of performance. Check www.enerlogic.com

Removable films have one major issue with them....they need to be removed. The likelihood of being able to be removed, stored, and replaced successfully in the future is slim to none.

Most folks can much more effectively control heat gain with shades.