A certain amount of humidity in your home is desirable for comfort during the colder months. Windows, doors and skylights that are not energy efficient will often collect condensation or frost even when the indoor humidity is at a reasonable level. Besides obscuring the view, this condensation can lead to mould formation on the frames and sashes. EnergyStar-logo-with an energy-efficient ENERGY STAR® qualified product, it will take a higher indoor humidity for condensation to form. With well-controlled humidity in your home, you may even be able to turn down your thermostat and still feel comfortable. Because humidity levels are normally higher in bathrooms and kitchens, consider installing an appropriate ENERGY STAR labelled product in these rooms to reduce or eliminate condensation on windows.