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

9.33.4.1.Design of Heating and Air-Conditioning Systems

(1) Heating, ventilating and air-conditioning systems, including related mechanical refrigeration systems, shall be designed, constructed and installed to conform to good engineering practice appropriate to the circumstances such as described in (a) the ASHRAE Handbooks and Standards, (b) CSA F280, “Determining the required capacity of residential space heating and cooling appliances,” and the outside winter design temperatures shall conform to MMAH Supplementary Standard SB-1, “Climatic and Seismic Data,” (c) CAN/CSA-F326-M, “Residential Mechanical Ventilation Systems,” r1 (d) the NFPA Standards, (e) the HRAI Digest, (f) the Hydronics Institute Manuals, and (g) the SMACNA Manuals. (See also Subsection 9.32.3. for the design of systems that also provide ventilation.)
← Previous9.33.3.2. Outdoor Design TemperaturesNext →9.33.4.2. Installation of Hydronic Heating 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.