Heat Loss Calculator [RE-wrenches]

[Ray Walters]

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Hi;

I've got a copy of Manual J. Its overkill for most residential, but its 
good. The problem is estimating your air infiltration losses without a 
blower door test. Its almost not worth using Manual J without a good 
infiltration number. Sort of like using a KWH meter to check all your 
phantom loads and then winging a guess on the refrigerator.
Of course there is engineering software beyond Manual J too, but once 
again without actual measurements of the actual construction used, its 
not going to be very accurate. (ie what if the guys that were supposed 
to put in the vapor barrier didn't seal around the windows and doors, or 
the cable guy came back and hacked holes in it?) All those estimated R 
values used in all of the estimators are only that: estimated, so I'd go 
with what Dan recommended.

Ray

 Jeremy Rodriguez wrote:

>Wrenches, 
>Anyone have experience with Manual J or other heat loss calculators?  
>Slant Fin, Wirsbo ??
>
>Thanks Again!
>
>Jeremy
>  
>


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