Insecurity about what? If you think that room temperature has nothing to do with how your terrarium or tub is heated, you must really don't know how any of this works. If the room isn't warm enough, heat tape isn't going to do anything except provide belly heat while the rest of the enclosure will be cold. Anyways, I'm tired of arguing with you. Good luck with thinking that heat tape can provide proper ambient temps without proper room temps.