As we are now in summer (you east coast people thought we'd never see it, did you?), we are in prime bug season. It gets pretty bad here in the very humid nation's capital.

At my parents' house we spend quite a bit of time outside in our backyard, which contains a fair amount of wooded area. This causes a large amount of mosquitos. We'd like that to not happen anymore

About 18 years ago we had a "bug zapper" installed. It was one of those purple glowing things that would make a pretty unpleasant glow every time a bug got zapped. the rest of the time it had a slight hum. The unit was only used for one summer, and is still standing there in our backyard.

My dad really wants to get some sort of really good bug zapper that doesn't make any noise at all. He's seen some that somehow silently kill the mosquitos and other biting insects and claim to be able to clear an acre of area.

Does anyone here know of any products like this? We're talking permanent, heavy-duty fixtures here.

Thanks for your help!