my house is too hot for most newts and axolotl. So i keep mine in a sun room type where it stays cold. BUT how cold is good? for

CHinese warty newt

paddle tail

and the temperate huge spanish ribbed?

axolotl?

is there a limt to how cold is too cold?

I put a heater in the paddle tail tank in the warty and axo tank because the temp at night drops to about 4c

i thought keeping there tanks at least 60 would be good? IF I bring them in room temp makes the water 75