Seems like it would be a lot quicker / easier to pick up a few large sunshades? Coolaroo makes roller shades up to 10ft / 3m wide which are easy to mount under eaves (no association, except I installed one on a west-facing balcony and it works nicely), if your structure has a roof with those. Then you can block solar heat in the summer, but let it do what it can for you in the winter.