92. Remember that it pays to invest in energy efficiency. In some cases, the money you save in energy costs can pay back the purchase price in just a few years.

93. Always read the Energy Guide label carefully, and make sure you’re comparing “apples to apples.” Energy use can range significantly even within a single brand.

94. Choose the capacity that’s right for your family. Whether it’s a furnace or a refrigerator, it doesn’t pay to purchase a unit that’s too large or too small.

95. In almost every case, a natural gas appliance is more economical to use than an electric model. The $50-75 price difference can be paid back in energy savings in less than a year.

96. Even if an appliance is still running, it might be time to replace it. An aging water heater or refrigerator could be costing you much more than you think. If your central air conditioner is more than 10 years old, replacing it with a high-efficiency new unit will cut your summer electric bills by about one-third.

97. Shop during the off-season. Many heating and cooling manufacturers offer significant rebates during seasonal sales promotions, and dealers may charge less for installation.

98. Investigate new technology carefully. Some innovations, like convection ovens or argon-filled windows, may save energy and make life more convenient; others, such as commercial-grade kitchen appliances, might be merely expensive cosmetic enhancements.

99. Look for the “Energy Star” logo. This designation from the Environmental Protection Agency means that the appliance exceeds minimum federal energy-use standards, usually by a significant amount.

100. Don’t forget to ask about warranties, service contracts, and delivery and installation costs.

101. Be sure to choose a reputable and knowledgeable dealer. A good dealer should be able to help you calculate energy savings and the payback period, and he or she should offer you a range of brands and prices.