As a mechanical automation's engineer that knows little about AC units I would guess sense you cant solder aluminium that you epoxy it but what do I knowAs an engineer the simplest things blow over my headI can tell you the melting point of osmium and how many isatopes there are in molybdenum but tying a shoe or using a microwave oven I can't handle
NoDue to the great difference in melting temperatures, soldering Cu onto Al is not practicalBoth materials need to melt, mix and solidify without movement to form a crystalline boundary structure that can hold together under the pressure the tubing needs to containIt might work if you could keep the molten Cu in place as the Al cooled down to the Cu melting temperature, such as repairing a crack in the bottom of an aluminum bowl where the copper can be kept in place and immobile during coolingRepairing a tube won't work because the Cu will stay molten and roll off the Al tube as it cools from its much higher temperatureYou should just replace the tube.
First thing is whether or not you are planning to modify the electrical and plumbing systemsIf you are, it has to be done firstThen you spray the insulation in between the wall studs, scrape off the excess, install a vapor barrier and hang the drywallThe loose type of wall insulation is usually blown into the space between the studs by drilling holes on the outside of the house and then filling the holes with plastic plugsI don't know if you can get the sticky stuffUsually it's only sold to professional insulation installersHope this helps.
Cellulose will settle after a time and the top few inches of the wall will no longer be insulated as well as the lower partSince there is no drywall yet, I would put in fiberglas batts.
