I have an Eagle Cap 1160, two slides. We are in our second year of ownership and have only used it winter camping three times. The last was this past March (in Alaska) and the coldest the temperatures got down to was -2. We were really impressed with how the camper stayed warm and toasty and it didn't seem like the furnace ran for extended periods. We did not experience any winds during that trip and I'm sure that played a big part. I hope to use the camper a lot more this winter as I should have more time...work permitting.