In winter at our farm we would leave for up to ten days, by first informing our customers a few weeks in advance of the days that we would not be shipping. The day before leaving we would bypass the warm water straight to the drains, raise the water levels a bit, and turn the cold water down to a trickle. Before leaving town we would make sure the Bullfrogs and tadpoles were in torpor on the bottoms of their troughs.
Several times, upon returning there would be a skim of ice on the surface of the water in the troughs. Our animals suffered no morts or ill effects once they were slowly warmed back up.
In warmer weather we had a renter who was happy to spend an hour and a half a day feeding and cleaning in return for a $75.00 per day discount on his rent.