new purple martin house

Thanks for adding more info. I just found a website, Purple Martin Conservation Association, and emailed a "mentor". If too late this year maybe I'll be ready for next year.

purple martins eat wasps.

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What makes them and their houses special?

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they nest in colonies, so the houses usually have multiple dwellings. They nest in gourds, too. They are picky about their surroundings and don't tolerate other birds (sparrows) well. If you can get a colony nesting in your house, they'll return every year. They eat mosquitoes (lots of them) and are spectacular flyers with melodious songs. Awesome little creatures and a highlight of my spring/early summer.

Will they run off Barn swallows from my eaves? If so I will build them a damn 5 star hotel to keep those suckered out from under my porch and eaves.

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Beal analyzed 205 stomachs of martins collected from February to September throughout the United States and Canada. He reported no mosquitoes in any of the stomachs and most of the insects found were relatively large ones. Johnson analyzed stomach contents of 34 Purple Martins collected during April through August in Kansas. He reported that 3 percent of the insects found in seven martins collected were culicine mosquitoes, but no mosquitoes were found in stomachs collected thereafter. He concluded coleopterans (beetles) were the items most frequently taken during this study, that the martins ate considerably more dipterous (flies) in April and May than later in the season, and that by August hymenopterans (bees, ants, wasps) were frequent food items.

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They feed at higher altitudes than mosquitos fly, which is what that study you're referencing found. They like dragon flies, beetles, flies, and wasps.

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Will they run off Barn swallows from my eaves? If so I will build them a damn 5 star hotel to keep those suckered out from under my porch and eaves.

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No.
Why the hate for the swallows? Too much of a mess for you?

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Forgot the study, but it showed Martins to eat very few insects.

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I've witnessed them eat the shite out of some dragonflies. There's also a video on youtube of a girl flicking grasshoppers in the air and the martins grabbing them.