I have a question about the correct Climate Zone for 90.1-2010. This is for Toronto, Ontario. Table B1-2 lists Toronto in Climate Zone 6. Table D-2 shows HDD = 7306 for Toronto.

But the ASHRAE Fundamentals 2017 and the Ontario Building Code show HDD = 7006 for Toronto. That would put Toronto in Climate Zone 5.

Therefore, I am wondering if I should use Climate Zone 5 for determining the baseline model envelope characteristics for a LEED v4 submission? Or would that bring the wrath of the reviewer?

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D307A6.548D5370]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada

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