Sorry Ricod;

If you want to play with the big boys, you're going to have to pony up for
the software [like I did / do.]

If you want some 'free' answers to load questions, then take some classes.

Otherwise, hire a professional, and have him/her install your system. FWIW:
on 600 square feet, if its just one large room, you might consider ductless
units to heat & cool your space. Even if it is separated in to two spaces
with a partition, you can have two indoor sections with one outdoor section.
--
Zyp

"RicodJour" wrote in message
ups.com...
On Jul 11, 4:31 pm, "longshot" wrote:
"Tony" wrote in message
"Noon-Air" wrote in message
"RicodJour" wrote in message
On Jul 11, 12:25 pm, ValveJob wrote:
"Jeff Dieterle" wrote:

Does anybody have a link to a manual heating & cooling load
calculator. I
want to size a mini-split system for a 20x30 detached garage
addition.
All
I've found on the web are offers to purchase load calculation s/w.

That's 600 square feet and NOT a standard home. I suggest you do
2
tons (24,000 btu).

But if you like it to get cold fast, then 3 or 4 tons.

If you just want to remove the humidity and cool it to 80 on a 95
degree day, then 1 1/2 ton (18,000 btu) will work just fine.

In other words, forget the calc. Completely useless. The
important
question is to ask the owner what he wants to accomplish with his
AC.

Whos ass did he pull those numbers out of??

You may not like it but is very reasonable answer!

I was thinking the same

Well, if you're making the same assumptions, sure, it would seem
reasonable.
Let me ask you a few question to see what assumptions you've made.
Where is the garage located?
What is it's exposure?
What is the construction?
What are the design temperatures?
What takes place in this garage? Are there additional heat or
humidity loads?
Is there a 2nd floor?

Comments such as, "In other words, forget the calc. Completely
useless. The important question is to ask the owner what he wants to
accomplish with his AC." are worse than useless, they're misleading.

Starting with a wild-assed guess based on all sorts of assumptions
isn't designing a system.
Oversizing a system is bad, undersizing a system is bad, and you're
pretty much guaranteed to have one or the other with WAG designs.

R