Even though she felt confident that she could rest inside the house comfortably for a few days, Hermione knew better than to get complacent. She made as little impact on the woman's dwelling as possible. Lighting a fire in the fireplace might have been noticed by a concerned and nosy neighbor. Any amount of smoke swirling out of the chimney could bring the front door crashing down by a citizen's call to the fire services. Turning any of the lights on or off could also draw unwanted attention.