I fell for those (on this board) who said get the electrified tennis racket swatter. Yeah, if I could use a tennis racket that well my name would be Serena.
It definitely killed them. A manual swatter is much easier to wield and have success. IMO
@Darren_Garrison I don’t mean to doubt your knowledge on this, but a fly is a fly. Moist environments with a food source is gonna attract them.
Even moist leaf litter, fresh wood cuts at the wood pile, bird seed on the ground. The ones I see most are at the pond edge when frogs lay their eggs. Some are always beached, Flys really go for that buffet.
Flies coming in the house can be mitigated, (well, if you don’t have grandkids air-conditioning the whole outdoors), it just takes dedication.