The heat from the hairdryer shrinks the sheeting to the window. It is pretty inexpensive, can be quite effective, and is easy to remove in the spring.
NH Office of Energy and Planning
Governor Hugh J. Gallen State Office Park
Johnson Hall, 3rd Floor | 107 Pleasant Street | Concord, NH 03301
(603) 271-2155 | fax: (603) 271-2615