Hello! I'm looking into purchasing an already converted school bus to live in full time in the PNW with two cats. Because of the cats I want to make sure the space is well insulated. The bus already has a bed, a kitchenette, and a sitting space drilled in, is it possible to place insulation around these fixtures and still achieve effective insulation?
Your best bet would probably be blown in fiberglass or foam, because a small hole is all that's needed.
You can still improve insulation, but it'll never be perfect once everything's built in. Focusing on sealing gaps and drafts might matter more than adding thickness.