[Greenbuilding] Energy calculations

Ross Elliott relliott at homesol.ca
Thu Jun 16 14:52:31 CDT 2016


John, that may not be true, not many contractors actually qualify. If the HVAC contractor is not trained and certified to provide an F280-12 heat loss / heat gain calculation and do not have an HRAI designation or equivalent, ideally also a BCIN number, then they shouldn't be sizing equipment anymore. The old ways are no longer acceptable but many HVAC contractors are still using inaccurate rules of thumb or obsolete calculation methods. This is actually a significant problem as homes are getting more efficient, there's way too many comfort complaints these days when proper design and some up-to-date building science knowledge is all it takes to make it right.

Ross Elliott

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Message: 2
Date: Wed, 15 Jun 2016 11:46:00 -0700
From: "John Salmen" <terrain at shaw.ca>
To: "'Green Building'" <greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] Energy calculations
Message-ID: <020101d1c736$2a52dcd0$7ef89670$@ca>
Content-Type: text/plain;	charset="iso-8859-1"

The HVAC contractor who did the actual work would qualify to revise the calculations to see if they meet the 58k BTU available (shouldn?t be difficult to meet that with even a rough model) . All the inspector wants is a letter in the file. 





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