It’s been pretty cold here. We have central heating which works well. I tell the guests where the thermostat is before the check-in and also in the house manual. Before I leave the day they check in, I set it to about 65 and encourage them in my message to adjust it up or down when they get in, depending on their preferebce, It’s a small house which heats up quickly.
(I do very short stays. If I did long term ones, this might be a issue I would have to think about.)
I also provide extra blankets in all the bedrooms and a selection of hot beverages.
Summers here are hot and humid. There are window AC units in all the bedrooms and the living area. I’d rather have central AC, because the windows units can be noisy, but it is what it is...
I keep the filters clean and explain how to use them in the house manual.
Ceiling fans are something I’ve been thinking about... I think they can help a lot with cooling rooms down so that there is less need for ACs.
mabye will install a couple of them in the spring.