We picked up our 2016 2351 in December and headed to Florida the day after Christmas. Our first stop was a Flyingj in Carlisle, PA and it was 6 above and windy. My wife sleeps on the power slide out sofa and complained it was cold while I sleep on the rear side bed. Anyway, I felt a slight breeze but could not find it. I remembered someone on this forum telling about the chassis heater vent leaking cold air. Started the motor, turned the heater off, and all was well. We have been out in some very windy and very cold weather and had no problems. Hope this helps.