One week is fine. Its just an adjustment period. A stressed snake who has just been thrown around in a tiny box will probably not feel safe enough to eat until some time has passed for him/her to get adjusted to the new environment.

Your hot spot should be no more than 94*F and that is not even close to the temperature required to melt or burn plastic, carpet, or wood. As long as you are conrolling your heat source with a thermostat, there is no risk of things randomly catching fire.