E-1.1, r. 1 - Regulation respecting energy conservation in new buildings

Full text
101. Air systems that serve more than one temperature controlled zone, such as multiple-zone and dual-duct systems, shall be provided with controls that will automatically reset the temperature of the cold air supply to the highest temperature that will satisfy the temperature controlled zone requiring the coldest air and reset the temperature of the hot air supply to the lowest temperature that will satisfy the temperature controlled zone requiring the hottest air.
O.C. 89-83, s. 101.