When we lived at the beach, we had a broiler of a back deck on the side of the house that didn't face that nice ocean breeze.
We had a very simple solution--I ordered grommeted shadecloth fabric from a greenhouse supply company in 80% shade. The grommets were 3 feet apart, and I put hooks around the porch to hook it. We bought shadecloth for Dad's high humidity beds where he grew tea, so I could take my choice of suppliers.
It was durable, worked like a champ (lowered our utility bills because it shaded the back french doors that led into the kitchen as well. We used it there for 8 years, and because the breeze could blow through it, we didn't even take it down for hurricane threats. Perfect...well, except for the hole DH burned in it by letting the grill flare up below it. Melted a nice little circle in it.
We sold that house in 2003 and took the shadecloth with us. It has been in use as a cover for our sheep pen ever since then, and is still in usable, if a bit threadbare condition around the edges.
I think it probably cost $200 buck back in the day. Fantastic bargain.