[hutzlibu]

Oh yes, I live directly next to a wild river valley, so just opening the window and hold them next to it would have (literally) cooled them. The wind, the sound of the water, the cool breeze.

And if this was not enough, carrying them with a manduca on the back or front and walking outside was always working. Also sometimes in the middle of the night, giving the mother a rest.

Now that they are bit older (and heavier) I only do this rarely. The trick is to have been outside enough with them in the first place. And if their head gets hot - literally cooling them with some water on the head helps very much.