[jfoutz]

Working graveyard and renting, I learned aluminum foil is perfect. cheap, trivial to install and remove. and perfectly opaque.

[swayvil]

What did you use to attach the foil?

[jfoutz]

my windows had little bits of molding and surfaces for the foil to crumple up against and conform to. I didn't need anything else. I suppose tape would work.