(Bloomberg) -- Johnson Controls International Plc is exploring a sale of a portfolio of heating and ventilation assets that could be valued at as much as $5 billion, people with knowledge of the matter said.Most Read from BloombergPutin Sends US Signal on Ukraine Talks, Seeing War AdvantageOne of World’s Richest Doctors Sees Fortune Surge to $12 BillionFed’s Preferred Inflation Gauge Cools on Robust SpendingUN Court Tells Israel to Protect Gazans, Avoids Cease-FireJPMorgan Shuffles Top Managers