A/C Lines Inside or Outside?

[Lindy911]

I’m just finishing R-19 insulation on the walls of my barn / shop, and am going to install a mini-split soon. I wanted to run the lines inside behind the insulation, but a friend advised that outside would be better because of possible condensation issues. Just trying to get a little cleaner looking installation.

Any thoughts on this?

 

[mustangacman]

I would run them inside wall. Both lines will be insulated so no condensation.

 

[yeldogt]

I always do them inside ... you want them on the inside of the insulation .... you want both lines insulated.

I hard pipe the drain in PVC and use a dishwasher fitting to attach to head

 

[nadogail]

If possible the lines should be run inside the building and insulated.

That being said, the lines on my home are on the outside because the house is 25 years older than the AC system. The lines are insulated and covered with a sheet metal box.

 

[dcg9381]

I do them inside. I use 2" gray PVC electrical conduit and slide the insulated lines in there. I do it outside when the walls don't allow access.

 

[rok_hunter]

My DIY mini split put them outside.

Sent from my Pixel 2 XL using Tapatalk

 

[jeepxj]

inside the wall is fine

 

[Jim greengo]

Just make sure nobody runs screws through the wall.

 

[Lindy911]

Thanks to all you for sharing your insights. I’ll run the pipes inside too.

 

[DHCrocks]

Even though the lines are insulated they can sweat. I have mine in those outdoor plastic lineset covers and on hot humid days I can see condensation on the plastic covers. the insulation on the tubing is not that thick so I guess some heat transfer is still taking place. I would hate to have that in a wall and sweating.

 

[Lindy911]

Since the Houston area has such high humidity, sweating is my concern. I may try running the lines in a plastic pipe as was suggested. This may help direct condensation where needed, and help protect the lines from damage.

 

[yeldogt]

Since the Houston area has such high humidity, sweating is my concern. I may try running the lines in a plastic pipe as was suggested. This may help direct condensation where needed, and help protect the lines from damage.

A pipe will only hold the humidity and concentrate into a drip .... inside of a sealed wall on the conditioned side there will be no issues.

 

[Black Oak]

I'm considering something similar . Lineset would run into the attic , slope down to soffit and out . Entire lineset would be in Sch. 40 4" PVC with additional foam insulation added .The attic has extreme temps in the summer , and the fear is condensation and sweating . The pipe is sealed from the air handler to the exterior . Am I heading for trouble ?

 

[thammel]

I have 2 Mr Slim units and put both linesets in the wall; I have 2x6 exterior walls so this was pretty easy. The upside is a clean exterior. The downside is if I ever have problems it will be a real hassle to get to them.