Mine get 2 or 3 hours of evening sun.
The brood nest of a large cell colony is around 93*F. Natural cell a degree or two higher. What happens when the temperature goes above that level???? The colony will beard if in the evening. They will also send foragers to seek water so they can swamp cool the hive. They will reassign workload away from honey production towards airconditioning.
After one of these incidents where the mother left a child in the car during the summer and the child died from heat, I put a recording thermometer into a white car. It got up to 150*F in about 30 minutes. Yes, I live in the subtropics of the Deep South. What's the difference in a white car and a white hive? You are greatly increasing the heat load leaving the hive in the full sun.
Beekeeping is location dependent. Locally, where do ferel swarms choose to build? A lot choose trees. Trees are in the shade. How many choose to build in an attic?????
I have few SHBs. SHBs are more of a management and genetic issue. Of my 20 hives 19 are ferals and Carpenters allogroomers and one is a split that someone gave me off a South GA package . Guess which one has the most SHB. There is no comparison.