Re: 350W!!
My home office has 3 systems in it, the mediaserver that runs 24/7, a work rig that runs 30hrs a week and my personal gaming system that's probably on for an avg of 8hrs a day. It's also in a South facing room that gets lots of direct sunlight.
So I actually leave the doors to the office and the bedroom next door open, to allow the heat to spread throughout the upstairs rooms. It reduces the need for radiators being turned up during the winter. In fact, it's only the North facing master bedroom and ensuite that have their radiators on full as those rooms can easily be 4-5ºC colder than the rear South facing ones... partly due to the bay window and less insulation above it that the rest of the roof. So allowing the extra heat from those rooms to spread out evens the temps upstairs and reduces the need to heating to come on upstairs.
It's a terribly inefficient way to heat a home, but they'd be on anyway... Might as well make the most efficient use of the waste heat that I can.
A friend has the same issue... his solution was to buy a portable AC unit... increasing his power usage significantly. He's much cooler than me in the summer as all I use is a fan to circulate air and open windows... But he's got a smaller house and uses 20-30% more power than me... and that's without factoring in the solar and battery system I have that reduced electric import from around 5500kwh a year to 1500kwh as well as earning me a little extra money of my bills from the export (£151 in 2023, £95 in 2024), this month alone has earned me £36 and the gas/electric bill is currently £25 inc all charges.