Q Team:
Seems there are new neighbors to the SE and they had workers covered with long sleeves and hoods working on a huge compressor in their backyard all day yet it was in the mid 80's. The people to the NE had that for a while until the owner lost his ability to walk and got rid of it afterwards. These may be ionizers or some type of industrial misters, please check out with a drone. Definitely not a central air unit. Remember the enemy moves in one direction.