> The white insulation material, typically made of polyethylene or similar compounds, was found to degrade prematurely when exposed to UV radiation.
According to my contractor, this was a problem with lineset manufactured in 2016 and a little after. All of the HVAC companies that I called understood the "white lineset" problem.
https://minisplit-services.com/blog/f/why-is-white-line-set-...
> The white insulation material, typically made of polyethylene or similar compounds, was found to degrade prematurely when exposed to UV radiation.
According to my contractor, this was a problem with lineset manufactured in 2016 and a little after. All of the HVAC companies that I called understood the "white lineset" problem.