greeneyelashes

We found two ducklings in the street near our house so we took them to raise, since we couldnt find their nest or mother. We've had them for a week and recently one of them got unexpectedly sick and died. The other seems to be perfectly healthy, but we dont know much about raising them. Right now he's in our unairconditioned pool house, but when will he be able to stand cooler temperatures and stay inside? Any advice at all about taking care of them would be greatly appreciated.
-Samantha