Heat/air question again

[Joe]

[stryped]

I have corregated metal siding. Do you really thing a window unit would cool a 30x30 with 10 foot ceilings?

Update:

I found a 2005 2 ton heat pump/air conditioner package system for 500 dollars delivered to me.

[gfretwell]

A split system will be split when you get it. You need to put it back together and charge it. The $300 deal sounds high to me unless this guy will go over the system, verify the charge is still right, install it and give you a year or two of guarantee. With all of that it is probably an 8 SEER and the new ones are many times more efficient. The mini split I have ordered is 26 SEER.

You are right that if you could find a little fresher package unit with a 14 SEER or so that might be worth doing and you would just have to run a little ductwork to get the cold air away from the return. I would duct the return straight to a filter/grille inside where the unit sits. Run a plenum up the wall and split out a couple round ducts along the ceiling or through the attic to the ends of the building. The only problem with running them outside is you really need to insulate the hell out of that chase and use a vapor barrier on the outside or it will sweat like a pig on your plenum. I would use a duct board plenum and then cover that with 3" minimum foam blocks and cover that with foil, then put on your sheathing.

The trick is finding a good, used package unit for a reasonable price. $300 for a Reagan era clunker ain't a good deal.

[gfretwell]

That sounds more like you

[Evan]

Yes the lines are copper... Soft, old copper... Bend it or kink it too far and there goes your charge and your line...

~~ Evan

[stryped]

I think running the grill straight in front of the unit to the inside of the building is the way to go. Easiest would be to install some sort of duct ont he outside up to the attic then through the corregated metal into vents in the ceiling.

Is there much different performance or duct cost wise in running it on the outside of the building verus in?

[Ed Pawlowski]

You have no sense of humor do you. Can you just imagine taking an entire system intact? Really, think about it.

[Oren]

I'm with you!

"Should be fun to watch." as you stated.

[gfretwell]

It depends on how well the chase you build around the duct is insulated

[stryped]

I think a chase would look odd, are you meaning just a square up the entire building covering the pipe? Cant you get outdoor rated insulated pipe?

[gfretwell]

You can get anything but not cheap.

[jamesgangnc]

Your cheapest and most effective solution is going to be to put the duct inside the perimeter walls. The inlet/outlet of a package unit is at the same location. If you run the outlet up the outside then you will also need to extend the inlet over to the wall. You will need to "weather proof" both. Package units are typically installed flush against the perimeter wall. Again, a corner would be the obvious best location as that allows you to box in easily. You can make it more complicated but I gathered from most of your earlier posts that cost was a significant factor. As you make the package unit installation more expensive then you might be better of with a traditional split system.