Ashrea Fundamentals 1989 has a very comprehensive heating & Cooling load
calculation section. It's often used for teaching the craft.
Quite often a 2 story concrete building with a built up roof, tar & stone
over foam & reasonable windows, will take a first year student 2 or 3
weeks
of hand calculation to come up with something in the ballpark. Then, of
course we have a storm that tears off the canopies & knocks down the big
shade tree, ( I especially like that one!) & we have to re-calculate.
Rules of thumb work, but only in the regions I'm familiar with, & only
because I've done numerous hand calcs...
There are load programs out there that will give you the answer as well...
but as Don said, they can cost a bit.
Even if you ask for the load calcs prior to signing on for a new system,
will you understand them?
goodluck
geothermaljones
st.paul,mn.
"Dick Adams" <rdadams@[EMAIL PROTECTED]
> wrote in message
news:g343kl$2o4$1@[EMAIL PROTECTED]
> When I needed a new roof, it took me over a year
> to find a rep who knew roofing. One rep told me
> the job would be a roof over and would need 24
> squares. I knew the roof already had two layer
> and would be a tear-off - plus the roof was only
> 24 squares. Needless to say I am leery of home
> improvement reps.
>
> But now every one with whom I have spoken about
> a new AC unit has a Master License (I checked).
> But not one of them has done a load calculation.
> And the lowest bid for a 2.5 ton, Seer-15 is
> $5,400.
>
> Where can I find the math for a load calculation?
>
> Dick
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