Code Library › Volume 1 › Section 9.33 — Heating and Air-Conditioning
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.33.3.2.Outdoor Design Temperatures

(1) The outdoor conditions to be used in designing heating, ventilating and air-conditioning systems shall be the appropriate values for the location as set out in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data,” using 2.5 percent design temperature criteria.
← Previous9.33.3.1. Indoor Design TemperaturesNext →9.33.4.1. Design of Heating and Air-Conditioning Systems

Common questions about this part of the code

What indoor temperatures must a home heating system be designed to maintain in Ontario?How must heating and cooling systems be sized for houses in Ontario?What are the requirements for heating and air-conditioning ducts in Ontario homes?

Understand this provision in seconds

BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.

Try BUILDAiD Beta

Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.