Yes, cooler is better. That is why the local stuff is generally to bitter. Garlic on the other hand, grows like a weed out here.
I tried asparagus beans this year, but there is no sign of even a single bloom yet. The green bush beans have done really well and I am picking them really young so they are delicious and have made up for the asparagus beans. I am thinking of doing wax bush beans indoors this winter.