[Greenbuilding] HDD and how they are calculated (daily avg. vs hourly avg)

Reuben Deumling 9watts at gmail.com
Sat Nov 26 11:34:13 PST 2011


On Fri, Nov 25, 2011 at 8:38 AM, elitalking <elitalking at rockbridge.net>wrote:

> **
>
> HDD and CDD are used for quickly estimating seasonal energy loads that can
> be applied to envelope heat losses and efficiency of the HVAC equipment.
>

I was not aware of the fact that this was *the use* of HDD and CDD.
Personally I find them useful for other ongoing purposes such as tracking
heating fuel usage in relation to a measure of the (cumulative) outside
temperature(s).
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