Took this technique I learned in prison to make it bearable during the heatwave:
- Wet the window with a sponge or rag.
- Put aluminium foil up against it. Shiny side out. Cut beforehand on angled windows like that or use the roll on vertical surfaces.
- To cover the overlap, just wet the foil already on there, but be careful not to pull it off at the edge. An overlapping strip will stick to the other ones.
- Use masking tape to cover any overlapping edges that come away, as well as the edges that have a hard time connecting to the windowsill.
This keeps out an incredible amount of heat; you can feel how hot the foil itself gets during the day, while keeping the inside nice and cool.
I’ve heard a similar thing with plastic cling wrap. Tape it to the window frame with double-sided tape and use a hairdryer to further seal it to get that double pane window effect.
Or get the plastic wrap kit at home depot to avoid all that measuring and fusing them together
That is for winter? Not summer
I am not sure how plastic wrap is going to stop UV
Very effective for cold climate/weather, not so mach for heat.
I did this for the windows on an old 1920’s cabin in BC, the walls and roof cavity had been retrofitted with insulation, leaving the windows as the big heat loss spot during winter. Didn’t fix how cold it go inside during winter completely, but it did bring the unheated temp up a degree or two, which made heating and keeping a temp easier.
Summer, OTOH, it created a heat pocket that radiated more heat inside, so I did a covering for outside with light coloured heavy fabric (curtain fabric) for the outside.