Have had it for 13 years now.
Zero, the back of the unit is totally sealed apart from an access compartment about a foot from the bottom. Had a look in there. Seems to have a fan that’s going, some sort of “unit” Maybe condenser? And lots of “vanes” which although had a build up of fluff on it, the insides looked pretty clean.
No sign of any pipe work of any sort other than sealed refrigerant type?
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