Our patio faces west; hence too much heat to enjoy it in the afternoon. My problem is finding some sort of shade blind, sail etc�to fit the space. It's approximately 18' wide and 20' tall. Are there blinds that would work for that span? Or an awning (not my favorite)? Or would sail shades work? If anyone can direct me to manufacturers or any other info I would greatly appreciate it. I'm located in Washington state, if that helps at all.