Brandy Corporation, a calendar-year accrual basis taxpayer, signed a contract on December 27, 2013, for the installation of a new central air conditioning unit. Because of various shipping delays, the unit was not installed until October 21, 2014 and was never used that year. The unit was first used on March 28, 2015. For purposes of determining MACRS recovery deductions, what year was the unit placed in service?