hmm i've been lucky this year, not seen many about
simple way I have found is to keep the doors/windows closed as much as possible lol
True I have my bedroom window open most of the time cos it's so hot, but not seen 1 wasp in my room yet.
When they do get in they either get the rolled up customPC treatment(not ideal as it attracts more) or a healthy dose of fly spray, works a treat and no pheramones afaik since they only come out when you actually break the body(?)
I agree with you though, evil buggers need exterminating from the planet 8ol