Window unit or large unit outside?
Cover for the winter, or a screen to hide it?
Hi ! I wouldn't cover the unit ! It needs and flow around it as well as accessibility for servicing . I would use lattice fencing ( because it has openings ) and make it 3 sided
Leaving a little room around the a/c unit . Don't cover the top ! Just make it higher than the unit . It will keep the unit out of sight , but can be easily moved out of the
Way to service the unit . Another thing you can try are window boxes , placed on the ground , then place a trellis in them and plant flowering vines , like morning glories
And moon flowers.
Tarp would be water proof and pot a cover like a blanket or towel over it first then the tarp you could cut it and sew it or duct tape it