Might be worth adding my own experience here with Cope's gray treefrogs (Hyla chrysoscelis), about two years ago. We had a pair at that time that we brought from Kentucky to Europe when we moved here. After we arrived we moved into my parents-in-law for a short time, with the frogs: they kept their house very hot and as soon as we arrived the male started calling all the time. One night he grabbed the female and by the next morning we had lots of eggs, even though they only had a relatively small plastic lunchbox for soaking in, where they laid them. I presume if you want to breed these frogs increasing the temperature helps a lot.