For over 20 years the DrsC have owned a home in the Rockies, over a mile high. We've never overwintered there, winters at 6000 ft. are both long and cold. Summers, on the other hand, are near-perfection, except they're too short.
Thinking recently about climate change and the persistent claims the world is warming, it occurred to me having a home where it's too cold too much of the year is a hedge against global warming. If the world warms, our place in Wyoming will become comfortable for more months per year.
If it gets too warm we might have to install an air conditioner, something neither of our houses there has ever had (or needed). I won't hold my breath waiting for AC to become necessary. Also, at that altitude a rising sea isn't much of a worry.