I only have single stage controller and a chest freezer. To raise temperature on my lagers for a D-rest, I set the rest temperature, say 65F, fill a couple gallon water jugs with hot tap water and put them in the freezer. If not enough heat added, I repeat the process the next day. Not set and forget, but it works fine. Got the idea from the many who add frozen water bottles to a cooler or a chamber to drop the temperature, so hey, doing the opposite works too!