> I wonder if there's any future to running both an AC and a DC bus through the house I used to have a house built around 1950 which had combination 117/220AC

> I wonder if there's any future to running both an AC and a DC bus through the house I used to have a house built around 1950 which had combination 117/220AC and 25VDC wired throughout the house. The electrical box was sectioned and the 25V had a large transformer. The house had low voltage DC ceiling fixtures that were tricky to source, and everything in the house that was switch controlled was on relays that allowed multi-point control, smart timers, and various other functions. It was a chore to get replacement parts but fortunately the attic had gangways and such so replacing blown relays was not horrific once you had the replacement parts. It was perfect for upgrading to smart control which I did for about half the house before selling it. Here's the thing. Tons of houses back then were wired this way. It was the wiring of the future and they explicitly realized in the 50s that someday they would be able to have computers in the home, perhaps as small as a single room, control everything. So instead of an electrical closet there was an electrical room with enough space for a refrigerator sized computer should such a thing ever come to market. 1950s.