Natural light is one of those home features people rarely think twice about until summer turns it into a line item. The same south-facing windows that make a room feel bigger and brighter can also spend hours feeding heat into the house, leaving the AC to undo it later. After a record-hot July and another jump in cooling costs, that tradeoff is getting harder to ignore. The answer is not to turn a sunny home into a cave. For most homeowners, the smarter move is figuring out which two or three windows are doing the most damage and treating those first. Natural Light Is Getting More Expensive to Keep Natural light still ranks near the top of…
