Window film or heat blocking shades?

[tru]

So it's an oven in my house, plus the AC broke yesterday and I actually wound up in the cool waiting room of our nice police station because the town made no provision for an ACed place for this type of thing on the 4th of July.

This gives me a foretaste of when global warming kicks in more and I suspect we'll run out of energy for AC.

A big problem is my house has south facing windows and the neighbor took down the big trees that shaded them.

So, window film or heat blocking shades? Assuming there is such a thing as heat blocking shades? And any specific suggestions for products?

I've planted trees, but I'll have croaked by the time they get big enough to do any good. Thanks.