I live in Pennsylvania and nights are starting to get cold. My ducks have a huge cage with a pond and an insulated duck house full of hay for them with a heat lamp but they never seem to be interested in going in there. I went out last night to check on them, it was 30 degrees, and they were swimming in their pool that I have in the cage. crazy ducks! I'm just very afraid that they'll get too cold. I'm not sure what to do, I'm just worried about them. Thanks!