OK, so see the cabañas?

N loves the cabañas. He doesn’t want to travel anywhere that is devoid of the cabañas. But here at our favorite place, they are only available between mid-November and April. In summer, there are only beach chairs with umbrellas, and those are uncomfortable and provide barely any shade.
Does anybody know why there’s a summertime absence of cabañas?
There’s an announcement up saying that the cabañas don’t appear outside of the winter months, so I’m not inventing it. I want to ask the rental guy but I’m not managing to coincide with him.