If it's 66 they really don't need it. It doesn't do them favors to keep them "toasty" and 66 isn't at all cold for them (I'd consider that fantastic daytime highs for 1 week olds). You only need it to stay above 50F if the heat plate specifies that as the suggested bottom range of operation.It got cold in the garage last night, 66 ambient temp - 84 under the plate, where they hung out
But adorably, when I visited them in the early hours they woke right up and popped right out to walk around a bit and eat.
We are getting a space heater today because the next few mornings are cold. Will make it nice and toasty for them!