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Extra insulation on outdoor refrigerant lines for minisplit?

djmoore14 | Posted in General Questions on

I have a multi mini-split that has three indoor heads. For two of these, there is a 20/30 foot section of refrigerant piping that is outside and under a deck. No lineset plastic covering was put on it because it isn’t visible. It is insulated with what I believe is the standard insulation that Mitsubishi uses and I think the installers did a decent job with it. It doesn’t seem like a lot of insulation so I was thinking of wrapping it further but can’t find much information on if it is worthwhile, and if there is a standard product for this or just find something that works? Any thoughts on if anyone has done this and what they used would be appreciated. 

A couple of pictures are attached to show the piping insulation. The pictures are from the crawlspace just because it was easier to take at the time.

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  1. walta100 | | #1

    Feel free to add insulation to the lines if it make you feel better but understand it will have a tiny affect if any on system performance.

    The lines are mostly insulated to prevent water damage the copper will often be cooler than the dew point of the air around it and will condense water on the pipe this water will the low spots on the pipe and drip off making a mess. The insulation is to limit the cold surface area and the amount of water generated.


    1. djmoore14 | | #2

      Good to know, thanks!

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