Retrofit installation of split inverter air conditioner

Dear forum,

perhaps I am just too late with my question, as I have already installed the air conditioning and now wonder if I have made a huge mistake out of ignorance. I live in a KFW 55 timber frame building, in which I have installed a 5.3 kW air conditioning unit. To do this, I simply made an opening from the living room to the garage and from there onto the roof, where the outdoor unit was installed. Now I of course went through the vapor barrier, but only laid a pipe from inside to outside. A friend who is a carpenter told me that this was not good at all and that it is very likely that the hole in the vapor barrier can lead to the penetration of moisture into the insulation. The hole is mostly filled with the pipe, but surely some residue was cut away on the sides, so it really won’t be sealed there anymore. Do I need to take action here, or is the risk due to the size rather negligible? If I need to take action, what would be the most sensible procedure? I have already had an opening made for water (drilling a well unfortunately didn’t work), and this was also not taken into account.

Thanks for the advice. Best regards

You must definitely restore the airtightness.

You absolutely have to restore the airtightness.

To my understanding. Airtightness between my garage and the house, so inside the inserted pipe, or airtightness of the vapor barrier, meaning basically extending the vapor barrier and sticking it to the pipe from the outside? Option 1: Simply fill the pipe with insulation material and seal it from the outside with sealing compound... should be easy Option 2: Open the drywall, open the OSB board behind it, without destroying the vapor barrier around the hole and bring the vapor retarder around the pipe... I think that is a big effort... especially since the thing is already hanging on the wall, it can remove some of it, but certainly cannot hold it in position... So... hopefully option 1 Many thanks so far

There are adhesive collars for penetrations through the foil. The electrician you trust should bring you something like that for a small price from the wholesale store.

This way, the pipe is glued airtight into the foil. Now maybe just generously smear the pipe with silicone?

Option 2. You must seal the pipe at the vapor barrier to be sure. Therefore, you have to tape the foil and the pipe there. Whether with cuffs or vapor barrier tape is up to you. Without it, you will have a potential spot for the entry of condensate into the studwork and insulation with all the consequences.

P.S. I am currently installing 4 air conditioners at work and am considering (since I still have 2 left) adding 2 more at home to the ones already there. It is getting hotter here year by year.

How do I get to it best now? Anyone have a good idea? I'd rather not dismantle everything again, would then have to dismantle the [Anlage] again...