Why do retail pre-fab kitchen cabinets fail in the Inland Empire?

“Pre-fab cabinet retailers build boxes from particle board and MDF that absorb moisture when Inland Empire temperatures exceed 100°F — the heat expansion causes swelling, the face-frame lacquer peels, and within 5 to 7 years the entire cabinet box delaminates from the inside out. We build using cabinet-grade plywood with dovetail-joined drawer boxes and mortise-and-tenon face frames.”