We have a screened gazebo on our back deck. We are putting in a hot tub next month and our first thoughts when we looked for a location for it was, Will a screened gazebo fit over it there?
Black flies arrive first and they don't itch when they bite, but afterwards the bites are BAD; then comes the mosquitoes and they are HUGE and voracious. Then in August we get deer flies (We call them stouts) that are big and buzz around you and really hurt when they decide to bite and during hot weather we can get sandflies (nosseums) and they are tiny, tiny hence the NO SEE 'EMS name and sting like crazy and raise crazy huge welts.
We have a Skeeter Vac, screened gazebo, OFF repellants and since none of it is full-proof, we stock up on After-Bite... an ammonia based liquid that takes the sting or itch away immediately!