You can get away with no A/C a lot easier if you're almost in the Arctic circle. In reality I bet this rule has a fairly minimal impact on energy consumption because the buildings didn't need much air conditioning to start with.
It’s possible to build buildings that are reasonably comfortable in high heat. It just costs more than a generic box with AC.
I honestly find working to be harder in that environment. German summers are traditionally not that long, but still it's two months of lower productivity.
There is one benefit though, shorts and sandals is accepted as office clothing.
I live in a country that uses traditional brick and mortar construction and I can tell you that American homes are far easier to condition climatically.
(though I couldn't get it exactly right on streetview)
Lee | Air conditioning. Air conditioning was a most important invention for us, perhaps one of the signal inventions of history. It changed the nature of civilization by making development possible in the tropics.
Without air conditioning you can work only in the cool early-morning hours or at dusk. The first thing I did upon becoming prime minister was to install air conditioners in buildings where the civil service worked. This was key to public efficiency.