The Ontario Building Code | Temperature Control in Dwelling Units

12.3.1.3. temperature Control in Dwelling Units

(1) Except as provided in Sentence (3) and except where space heating energy is provided by a solid fuel-burning applianceor a ground source heat pump, the indoor air temperature in a dwelling unit shall be controlled by at least one programmable thermostatic control device.

Note: On July 1, 2017, the heading to Article 12.3.1.3. and Sentence 12.3.1.3.(1) of Division B of the Regulation are revoked and the following substituted: (See: O. Reg. 139/17, s. 145)

12.3.1.3. temperature Control in houses and Dwelling Units

(1) Except as provided in Sentence (3) and except where space heating energy is provided by a solid fuel-burning appliance or a ground source heat pump,

(a) where a housecontains two dwelling units and each dwelling unit is served by a separate heating system, the indoor air temperature in each dwelling unit shall be controlled by at least one programmable thermostatic control device located in the dwelling unit,

(b) where a housecontains one dwelling unit or contains two dwelling units and both dwelling units are served by one heating system, the indoor air temperature in the house shall be controlled by at least one programmable thermostatic control device located in the house, and

(c) the indoor air temperature in an individual dwelling unit in a buildingother than a house shall be controlled by at least one programmable thermostatic control device located in the dwelling unit.

(2) The programmable thermostatic control device required in Sentence (1) shall,

(a) allow the setting of different air temperatures for at least,

(i) four time periods per day, and

(ii) two different day-types per week,

(b) include a manual override, and

(c) allow the setting of the air temperature to,

(i) 13°C or lower in heating mode, and

(ii) 29°C or higher in cooling mode, where air-conditioning is provided.

(3) A manual thermostatic control device is permitted if it,

(a) controls a heating or cooling system where the heating or cooling capacity is not more than 2 kW, or

(b) serves an individual room or space.