You can compare this figure with similar models to find one that costs less to use. You may want to rebuild your home with energy-saving window products. These include all types of windows, doors with windows, and skylights. This represents the National Fenestration Rating Council, which is the industry group that sets standards for U-value measurements. If home contractors install your windows, be sure to discuss what U-value is best for your home.
Watts measure the amount of energy used.
But different watt bulbs can produce the same amount of light. If you buy a lower watt bulb that provides the same amount of light, you'll save money in energy costs. There are several different kinds of bulbs. These are the standard light bulbs. To save energy costs, find the bulbs with the light output you need, then choose the one with the lowest watts.