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Posted by Tom in PA on July 1, 2006, 3:22 pm
Hi!
I'll start by saying that I know the correct answer is "consult a
professional to do a load calculation", but I've consulted two
professionals who are coming up with much different answers so I'm
feeling stuck.
The house is 2076 square feet, new construction, two-story with most of
the square footage on the ground floor. R-19 insulation in exterior
walls and ground floor joints, R-30 in ceiling. One big air return,
about 12 registers. 2x4 (I'm pretty sure, a slight chance it's 2x6)
frame construction. Furnace in crawl space under house. Have some
large windows in great room and a glass slider in dining room but these
all face north, otherwise normal sized windows. Located in Flagstaff,
AZ, elevation 6900'. Average high temperature in July (the hottest
month): 82 degrees. All-time record high: 97. Humidity: tends to
be quite low.... this is the Southwest. This is a town where most
people don't have A/C, and the unit won't be heavily used. You can
usually get by with your windows open and ceiling fans. It just gets a
little toasty now and then, which is why we want the air.
Once contractor says a 3 ton unit is the way to go, another says 5 ton.
Any opinions regarding who is right?
Thanks!
Tom in PA
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Posted by RSCamaro on July 2, 2006, 8:05 am
>Hi!
>
>I'll start by saying that I know the correct answer is "consult a
>professional to do a load calculation", but I've consulted two
>professionals who are coming up with much different answers so I'm
>feeling stuck.
<snip>
>Tom in PA
Well Tom in PA, I think that neither one of those contractors is
correct unless they went around your house taking measurements and
puting them down on a sheet of paper, or PDA, or computer. When you
find a contractor that does this, you'll be in much better shape than
the others who are just using the rule of thumb theory.
That would be to stand about 50' ft. from the house and hold up your
thumb and see how much it covers the house, if it takes 3 thumbs then
you need 3 tons. This is the kind of load calculation most of the a/c
companies do most often, or just change out the system like for like.
It's the homeowners responsibility to research the contractor as much
as it is the contractors responsibility to do the job correctly. So
call all of the contractors up and start asking questions.
...Ron
--
68'RS Camaro
88'Formula
00'GT Mustang
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Posted by daytona on July 2, 2006, 9:16 am
I normally go to the neighbors and see what they have ...then you get the
same size...that way there is no bickering over who's is bigger
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Posted by Stormin Mormon on July 4, 2006, 5:59 pm
It's a man thing. Women just care what color is the compartment, and
does it match their siding.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.
I normally go to the neighbors and see what they have ...then you get
the
same size...that way there is no bickering over who's is bigger
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Posted by aka-SBM on July 10, 2006, 12:27 pm
> It's a man thing. Women just care what color is the compartment, and
> does it match their siding.
>
You think so?
My experence shows otherwise.
When an Affinity is sold, the MEN always call up and go...Can I get that in
Blue? Can I get UNC panels for it?
The wives always just say...as long as the damned thing works..and they
normally write the checks too...
> --
>
> Christopher A. Young
> You can't shout down a troll.
> You have to starve them.
> .
>
> I normally go to the neighbors and see what they have ...then you get
> the
> same size...that way there is no bickering over who's is bigger
>
>
>
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