I think being in the shade helps in the summer time.
But, being in the sun during the winter would help a lot more..
The cost of summer cooling around here, is nothing compared to winter heating cost.
I've considered piping air in from under my den & deck. It would contain less snow..
And in the summer, it's cooler under there.
The earth tube idea is good, but the cost would be outtasight..
One other way would be to hang an HX with a lot of passthru at the intake,
and run coolant thru it via a big ground loop.. My ground water table is very close to the surface..
Make it into a hybrid AS/GS heat pump..