I just got a free mini fridge that I'm going to make into an incubator. It is the kind with a freezer on top with a separate door. For some reason, the freezer works great, but the fridge part doesn't cool but the light still works. I didn't really need either to work, but since the freezer does work, would there be a problem with continuing to use the freezer (I could keep frozen rats in it)? So, I would use the freezer all of the time, and set up the bottom part for the incubator. I didn't know if the freezer would make the incubator hard to keep warm enough and would the incubator make the freezer hard to keep cool.