flys in the house

Little maggot bastids have been horrible lately, neighbor has a bunch of cows. We have the water bag fly traps with the scent bag in them hanging under the carport and the patio. Bought 'em at the feed store. Must work, looks like 100 flies in each one, now if the other 556 that like to hang out under the A/C here in the house would follow suit.......used 4 cans of fly spray in the last couple weeks.