I have one of the strangely misspelled and slightly peculiar Chinese incubators for the 'bator itself. It is in the most 'stable' room in the house - by which I mean, the temperature doesn't rocket up too much. I'm in Australia, so it is starting to sometimes get very, very hot.
(The house has central heating, if that's what you are asking - though we turn it off this time of year!
We're one of the few households in Australia which needs heating as sometimes it can get to 0C where we are.)
I will try to put a bowl of water in the room where the incubator is, I admit I'm reluctant to put a humidifier in for human health reasons - my partner has some health issues with breathing that makes high humidity problematic. Fortunately, where we live it's dry most of the time. I know my cats will probably dabble in it. They love water.