Randomly,I'll enter my garage and hear my model S making a noise similar to the sound that the A/C makes.when I check the Tesla app (climate )I see the A/C is running. this occurs randomly and can be many hours after parking. Dog mode is off and I've even turned off cabin overheat and it still occurs. When I scheduled the car for service to check this, they texted back that it's "normal " and part of the design. I don't want to waste power or run the A/C unnecessarily.