Daikin will pay out millions after federal regulators said the company sat on years of warning signs tied to overheating air-conditioning units. The company agreed to an $8.5 million civil penalty after reports of fires and a smoke inhalation injury surfaced before a recall was finally announced. What happened? Federal regulators said Daikin Comfort Technologies Manufacturing, Inc. of Waller, Texas, did not promptly alert the government to a saf…