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Yes, precisely … but I think there is an issue with the transformer which would need to be energized 24/7 and uses power sitting idle …

I forget - I did look into this - but somehow the 110 to 12v conversation using normal components eats up the energy savings?

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Well, with people doing whole home solar, that wouldn't be an issue. You'd just need an inverter to power some appliances in the kitchen. At the very least, LED lighting hardwired into the home would drop electric usage by double digit percentages.

I definitely want to find the correct solution for this ... if not for my (already built) house, for our society in general.

In addition to the electricity savings, there is an enormous gain in simplicity and elegance in removing a lot of high voltage wiring throughout every room of the house.

As I mentioned, the high voltage hard-wired smoke detectors are another unnecessary set of high voltage circuits ...

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