Yeah, they don't overheat easily, if it's less than about 20 inside they're very comfortable for me, tolerable up to maybe 23. But they still make a huge difference outdoors or when it's cold inside. I wear mine to/at work, we have the office at 19 I believe.

They don't require a lot of washing, they still smell fine after 4-5 wears if you don't, like, exercise in them. Downside is they do need to be washed with wool detergent rather than normal laundry powder/liquid, but that's not a huge deal.

Mate, if you're bothered by the cold at the moment, get yourself some merino thermals/base layers (if you can afford them, smartwool, icebreaker, or similar brands are the best, but there are much cheaper options too). I'm from New Zealand where the weather is even milder than here in the UK (rarely goes below 0), but our houses are even more useless, often completely uninsulated and very draughty. So we're used to indoor temps of below 10 in the winter. When I was a student sometimes it was below 5 degrees, just the same temperature inside and out. Lived in thermals all winter as a matter of course. Now I've just brought that habit along with me to the UK and I'm finding it extremely comfortable here this winter.