If you drop one of your favorite steel planes and dent the sole, metal displaced from the dent will likely leave a raised ring around it that can scratch wood. Simply rub the surface with a fine honing stone to remove the raised area. Once done, you can ignore the remaining dent, oil the unplated surface, and put the plane back to work.
Don’t set your thermostat at a colder setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.