I have owned two box hangars at Mohave, CA and another in Wisconsin near Oshkosh. Plus, a bevy of leased T-hangars in various other places.
Another thing that you have to worry about in some places is the prevailing wind. My Mojave hangar faced south. The warmth was great about half of the year because it gets cold and even snows in the desert. Without humidity, it feels even colder still in the incessant high daily SW winds. There were times when I didn’t dare open the door for fear that everything inside would wind up in Barstow. One time, a horrible sand storm blew for days and deposited about 3 inches of blow sand INSIDE the closed hangar. Anyone who knows what blow sand is knows it could find it’s way into a coffin 6’ down. Getting it out took weeks because a subsequent HD thunderstorm literally washed a wall of water over the entire airport and turned the blow sand into a hard caliche mess that could only be washed out with water hoses. On another occasion, I was inside a small RV inside the hangar overnight when 100mph winds blew. The RV was actually shaking INSIDE the closed up hangar surrounded by other hangars. In the end, happiness was Kalyfornya in my rear view mirror at Blythe after 17 years in MHV. Even Burt Rutan gave up on the place and moved away in retirement. And that’s why thousands of windmills are located nearby that airport.
At Phoenix Deer Valley it doesn’t matter which way the hangar is pointed. You have basically leased a very large autoclave in summer time. Interior temps of 150 deg are possible.
In Wisconsin, the problem – as you describe – is cold. Not just cold but … cccCCCOLD! Last winter, wind chills were below -50 deg F. I think that’s pretty close to absolute zero. After the first winter, I learned that it was wise to make multiple sweeps of the hangar to remove any liquids that could freeze. I returned to find the gooeyest mess of Coke on the floor being devoured by several divisions of Army ants that had come out of hibernation. Mice can’t get in because the building gets hermetically sealed by snow which melts, freezes and repeats until spring. Fortunately, I don’t have to deal with it because I winter in Florida. I have access to the security cameras and an AWOS is located close by … so I can see what I’m missing. Nothing. Summertime, however, is spectacular.
Florida ain’t all that it’s cracked up to be, either. For a long time, I kept an airplane down here and left it behind. Every November when I’d return, the airplane always had problems with corrosion of one sort or another. I tried everything. Heaters, fans, windows open, windows closed, dessicant … nothing worked. In the end, I decided you can’t leave an airplane locked up in a hangar in Florida without being taken out and aired out and exercised frequently. In some ways, it’s worse inside a hangar because the relative humidity is higher than outside. I have actually had a problem with mold. Now, that airplane spends the winter freezing in Wisconsin … those problems don’t exist up there. Just don’t try flying until about April … as you say. And have I mentioned worrying about the airplane during hurricane season?
These locality based issues notwithstanding, I consider having a hangar almost as much fun and surely more practical than owning an airplane. In fact, if you own an airplane, it’s my position that you must have some sort of hangar. Besides, every problem known to man can be solved after aviating by a committee of beer swilling senior citizen pilots sitting in somebody’s hangar while watching airplanes go by.