*(all) set. (to do something) prepared or ready to do something. (*Typically: be ~; get ~.) Are you set to cook the steaks? Yes, the fire is ready, and I'm all set to start.
How long will the odor last from our newly installed cellulose insulation? The odor is kinda of like a mild ammonia smell and is only noticeable when we're running the a/c.
Everything conducts heat, but some materials are very good conductors and some are poor conductors. Insulation is made of materials that are poor conductors. The best insulation is air, because it is a gas and gases are much poorer conductors than solids and liquids. Also they are lighter, and light weight is always desirable for insulation. The problem with air is it moves around too much.