Thread: Looking for a good A/C installer (Manual J) - Denver Metro
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dpb dpb is offline
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Default Looking for a good A/C installer (Manual J) - Denver Metro
wrote:
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 point imo is more to find somebody who actually will do a reasonable
calculation and size it reasonably closely rather than putting in a 3T
where a 1.5 would do...

If it's new, more likely to be of value as if have existing unit that
works reasonably well, that's a good clue. If, otoh, the current unit
is obviously way over-sized, can't hurt...

A really good, experienced guy can probably do ok w/o it, but who knows
one of them, either?

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