Don't forget to drain your hot water heater. Faucets should be open. Personally after living in Alaska for thirty years we always covered the roofs and ac units. We also had to remove excess snow and ice a couple of times each winter which frequently meant replacing some of the sewer vents and an occasional roof vent, because you can't see them through the tarp or cover, and they don't like a snow shovel.
2014 Voltage 3950 Epic III
2006 Dodge 3500 DRW Cummins with edge juice with attitude
2013 Can Am Commander 1000XT