>Doesn't exposing the air conditioner the whole day, uncovered, to the sun and rain, shorten its use life?
It's covered, the control card, the compressor, the evaporator and the fan are covered in shielding. They're designed to work outside, of course theoretically it would work for longer if it was covered. Reality is, it hardly matters, if you built it a, let's say, tin cover the extra lifespan wouldn't be worth the cost of the materials and instalation, plus, I don't know about there, but here, I assure you you'd get a couple pigeon nests
>The air conditioner seems to me like an expensive object
Not really, a couple hundred dollars every 5 to 10 years. What's expensive about them is the energy they use