Hanging a bat house on your home isn't for everyone and certainly not everyone asks for that either, however there are serious bat house folks with dozens on their house without any ill effects, so to blanket statement to suggest it is always going to cause problems isn't true, a certain amount likely will, and plenty won't.
Bat bugs are no different than other ectoparasites we see on a variety of wildlife. I remember seeing snowshoe hare in MI covered in ticks, just nasty to look at. Have seen more than my fair share of coyotes covered in ticks, fleas, etc... Feral hogs with a ridiculous amount of lice, ticks, etc....
We have them too in our population, lice, bed bugs, etc... all human based let alone the micro organisms all over your skin right now...
How many clients have any of you had that had not only the siting or report of bed bugs but were also confirmed to have been bitten by bed bugs...? I'm not being snarky, I'm actually asking, how many because I have tons of clients with bat colonies that are well established and the insulation in the attics always has sign of bat bugs and live bat bugs, yet none of them upon asking them ever report bites, rashes, etc...
They just find dead bodies.
The other question, if you are treating for bat bugs and you have a 2 or 3 story structure and the bat bugs are in, under, around insulation, in wall voids, beneath cracks and crevices, how are you ever going to treat them to kill them off, or do you simply create a barrier in the living space with products designed for this species and for bed bugs?
I've only seen people treat the living space, so the bat bugs are still up in the attic doing their thing until they die of in absence of bats after the life span has expired...
Other issue is people not confirming when people have bed bugs but think they have bat bugs or might have both. Which one is doing the biting?
The other aspect related to the post above would be the idea that bat bugs aren't biologically based in terms of life cycle on bats and their life cycle. If bats are hibernating or even migrating short or long distances, the bat bugs have to be able to shut down, hide and wait for them to return in the spring. This relates to the probability of bat bugs becoming a real problem for people versus a perceived threat.
"Our migrate south? Maybe to the south side of the street..." - ditto, plenty of local hibernators in that state and plenty of hibernacula too, well documented...
Can folks who have had verified bat bug bites on their clients speak to this a bit, I ask every client I ever have if they've had issues that would suggest this, none have, they just get the creeps about these things crawling around and dying in their living quarters and thats the extent of it.
I know they can take a blood meal, they are built for it, but how often are they doing so with human host?
Thanks,
Justin