There's a Canadian company - Allanson International - making UV lights you can bolt into existing home ductwork for sanitizing your air; not a big deal if your windows are open all summer, but come winter when we're all buttoned up this will be important, IMO.
Inspired by a recent set of toots by @SexyCyborg I picked one up and just finished installing it. Dirt simple, took ten minutes.
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@mhoye I read a suggestion in a review to wire it into the furnace EAC (electronic air cleaner contacts), so that it's powered only when the furnace fan is running. Did you consider doing that, or are you planning to keep it powered on all of the time? I'm curious about the impact on bulb life
@keverets I bought a crimping kit specifically so that I could wire it up to terminals in the furnace to do exactly that, that I did not use because there is a line in the manual that specifically tells you in big bold letters not to do that.