I've started giving furnace, reefer upper & lower, and water heater vents, and the power cord box cover a 1-2 second shot of wasp killer each spring and about 6 weeks after thru the summer. This was after finding the beginning of paper wasps' nests inside the water heater door 2X & power door 1X in the same season. Make sure all LP flames are OFF first. I doubt the effect lingers enough to kill them, but it seems to send them elsewhere to build a home. BTW, this is despite the fact that the Tiger is driven at least weekly during the summer.
Jim, "I'm not a pessimist. I'm an optimist with experience."