LOL...Wow...you are already looking for spring?? Spring is a loooonnnngggg way off. LOL I don't blame you. I find snow truly disgusting, along with the cold and dreary days.
No, your Gambels won't need any heat, unless the temp drops below zero. They are desert dwellers where the temp commonly drops well below freezing. However they come from a very dry territory. So make sure they have adequate shelter where they can get completely out of all wind, rain and snow.