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04-26-2011, 06:11 PM   #1
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## help for gas usage

Dear Sir:

Does anyone can help me to do gas usage calculation?

I have 3 bedrooms/2.5 baths house in IL.
Above Ground Living Area
(Square Feet): 2048
Basement Area (Square Feet): 800
Years build 1980
Exterior Cover: vinyl siding
LENNOX gas furnace for years
Model: G20Q3/4E-100-3

Can you calculate gas usage from 12/8-12/29/2010 per below information I had?
Thank you! Amy

Note: *193 = gas usage during 11/19-12/22/10
*173= gas usage during12/22/10-1/6/11

Date---------------Days-- Temp°F ---HDD ---Gas usage (ccf)

09/30-10/21/10 --21 -----65 ----------154 ------65
10/21-11/19/10 --29 -----65 ----------502 ------65

11/19-12/08/10 --19 -----65 ----------663
12/08-12/22/10 --14 -----NA ---------NA -------193*
(*193 = gas usage during 11/19-12/22/10)

12/22-12/29/10 --7 ------NA----------NA
12/30-01/06/11 --8 ------70---------- 333 -------173*
(*173= gas usage during12/22/10-1/6/11)

01/6-02/24/11--- 48 -----70---------- 2275------823
02/24-04/06/11-- 41---- 67--------- 1203 ------263

Last edited by Amy28; 04-26-2011 at 06:23 PM. Reason: format

04-27-2011, 04:39 AM   #2

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Take the total HDDs for that total time period, and divide it by the total therms used over that same time period, and you'll have the average therms used per HDD. Not 100% accurate, but no way to be 100% accurate.

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