I have larger ones in the living room and the dining room. It's a large space. But all I do it keep it in the 70's.
I do have a heater in my bedroom wich includes my bathroom. It's still a bit cool so I run the hot water and then take a shower. Works well.
But since MN I tolerate cold and freezing temps better.
Charlie sleeps with me. CHance has it's own cage heater and I am going to buy a 2nd one in case we have another bad freeze like 2021.
Soli sleeps in my closet where the waterheater is.
He and kitty both have old towels or shawls to curl up on. Kitty & Soli take turns sleeping on top of Chance's cage. Which is why I want a 2nd bird cage heater. His cage is fairly big.
I layer.... the cats never go out and Charlie runs so much he is ok. Still I restrict how long he is outside. He has his own blankets.
I use less electricity winter then durin summer with the acs & fans.
I've pretty much got the sytem figuered out for all of us.
Love All Life, Thank You For Posting! :)