On Apr 12, 2:31*pm, stryped wrote:
On Apr 12, 1:07*pm, harry wrote:

On Apr 12, 6:34 pm, stryped wrote:

I have a 30x30 metal building. I have no windows. What would be the
best and cheapest way to air condition it? I thought about a window
unit but I have no windows and not sure if cutting the corregated
metal would work right.

If the building has no insulation you would be wasting your time. Just
leave the door open.

I am in the process of insulating it. The wals are 2x4 and they have
r-13 with paper face. I am putting foam board in the garage doors.

R-30 is going in the ceiling with a 6 milieter clear plastic vapor
barrier. I just started doing that.

Arent those mini systems expensive? Money is kind of tight.

I have been looking on craigslist for used heat pumps/air conditioners
that sit outside but have not had much luck.

Stryped:

The biggest question here is what sort of power you have
available in this building ??? Is it fed from another source
as an outbuilding or does it have its own power panel with
enough capacity to add a heavy load from an AC unit to it...

Do you have any means of heating this space right now ???
Would you want a system that is cooling only or one that
can do both heating and cooling ???

A split system is nice but expensive and would require more
than one interior unit to evenly cool such a large space...
Split systems are also packaged and you really can't modify
the interior unit to do much of anything with it... It will only
blow the air a certain way a certain distance from the wall
blower unit, after that you have to deal with whatever aspects
of your room like air leakage or poor air circulation in one end
of the building that will create areas where the temperature
doesn't equalize...

You could consider a PTAC (Packaged Terminal Air Conditioner)
unit like you would find in hotels/motels with a duct work kit...
You would not need a window to install such a unit and they do
come in 240v configurations... The units cool, heat (reverse cool
cycle) and can come with electric booster heater coils for when
the outside temperature hinders the reverse cool cycle and only
require a maximum of 30amps power feeder...

I guess the bigger question here is what you use this building
for and how cool you need to keep it ??? That would be the
information you would need to know in order to properly size
any sort of unit to the cooling load you will have...

A PTAC unit will only require electrical expertise to install,
a split AC unit will require familiarity with AC tubing and
having to take care with the tubes and insulating them when
you install AND require electrical expertise with rain tight
flexible metal conduits and weatherproof service disconnect
installs...

Once you know what size unit you need you can then
start looking for surplus units for sale on-line... If you go
into this by looking for what is cheaply available on-line,
you won't be choosing the right size unit for what you need
and would be like the tail wagging the dog...

~~ Evan