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Posted by on June 18, 2007, 12:45 am
>
> >
> >> On Tue, 12 Jun 2007 21:01:56 -0500, someone wrote:
> >>
> >> >
> >> >v would probably suggest a 3-ton unit in that example. <rolleyes>
> >> >
> >> The contractor can't "cut corners on the formula" because he likely
> >> doesn't have and doesn't know the formula anyway. He just punches the
> >> numbers in to something that he bought and then tries to impress you
> >> with the resultant printout.
> >>
> >> I used to do these "by hand" (okay, pocket calculator) back in the
> >> day. Don't confuse precision with accuracy. Garbage in garbage out.
> >> You are better off with someone who can make a reasoned estimate here
> >> and there, than with someone who laboriously inputs precise fractions
> >> but uses the wrong conditions and assumptions because he is just doing
> >> data entry and not understanding principles.
> >
> >
> >Yeah, well, we don't send out a rookie with a computer to perform a load
> >calc.
> >
> >If you'd send someone out that has HVAC knowledge, you would understand
that
> >a load calc *is* worthwhile.
> >
> >Might as well install that 5-ton unit, Eh?
> >
>
> Where I come from, rule of thumb for average constructed homes is 1
> ton/500 sq ft (8ft ceiling). Of course it's not calculated but I bet
> it's close to accurate for the average home where I am.
Where I come from, I do things correctly. That means the client gets a
Manual J to correctly size his or her new system. However, there are hacks
everywhere that use "rules of thumb" for just about everything. Their
clients are unhappy when they receive a quote to fix all the screw-ups.
Do it right, or do it twice. I garranty doing it right the first time is
cheaper in the long run!
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