For what it's worth, I've stored my car in an unheated garage for anywhere from 4-6 months during late fall to early spring…each year since restoration for about 13 years. I wash the car before storage, fill the tank and add StaBil. I do nothing to the battery, nothing for heating. Dehumidification makes no sense in the dry winter air here.
I suppose that a temperate, room temperature garage might be better, such as those "climate controlled" storage facilities, but I don't want to pay hundreds of dollars a month for storage.
While some of those ancillary things such as a battery tender, dehumidifier (wouldn't work in this climate for winter storage) or an auxiliary heater all have their place, I don't have a comfort level with anything plugged in and unattended in a distant garage that nobody goes to for months at a time. If the garage were my normal home, that's different.
I don't believe my car has suffered any ill effects from storage. Starts right up every time, even if it's been 6 months.