wrote in message
oups.com...
On Jun 12, 4:07 pm, (v) wrote:
On Mon, 11 Jun 2007 08:20:55 -0700, someone wrote:
...Someone who is thorough, will use correct
inputs, and won't cut corners on the formulas.

To what end is the need to be that precise? They will just size it to
the nearest ton (or maybe half ton) anyway. It's not like it's going
to make much difference if it comes out 38,052 btu/hr for the anal
retentive guy, or 41,019 btu/hr for the good enough for government
work guy.

And what if it's more like borderline - "back of napkin" calc will
suggest 2-ton, but Manual J suggests 1.5-ton.

The customer gets a complete print-out of the Manual J and Manual D
calculations that tell exactly what is required. Unless you do the math and
run the calculations, your doing nothing but guessing.
Do *you* want to base that kind of investment and cash outlay on a guess??