Refrigerators are typically the largest consumer of energy in a household, accounting for about 15% of total energy consumption.

The Energy Star program is a voluntary program that encourages manufacturers to produce energy-efficient appliances. Appliances that meet the Energy Star criteria are typically 10-20% more energy-efficient than conventional appliances.

Energy-efficient appliances typically have a variety of features that help them save energy, including variable speed motors, energy-saving modes, and automatic shut-off features.

Energy efficiency is a measure of how much energy an appliance uses to perform a task, while energy consumption is a measure of how much energy an appliance uses over time.

Energy-efficient appliances can help to reduce energy bills and greenhouse gas emissions, and they can also last longer than conventional appliances. However, they do not typically provide increased comfort.

Light-emitting diodes (LEDs) are the most energy-efficient type of lighting, using up to 80% less energy than incandescent bulbs.

Clothes dryers are typically the second largest consumer of energy in a household, accounting for about 12% of total energy consumption.

To save energy when using a clothes dryer, you should use the lowest heat setting possible, dry clothes in large loads, and clean the lint filter after each use.

Single-paned windows are not a type of energy-efficient window. Double-paned windows, triple-paned windows, and low-e windows are all types of energy-efficient windows.

To save energy when using a dishwasher, you should use the energy-saving cycle, only run the dishwasher when it is full, and scrape food off dishes before loading them into the dishwasher.

Energy-efficient appliances can help to reduce energy bills and greenhouse gas emissions, and they can also last longer than conventional appliances. However, they do not typically provide increased comfort.

French door refrigerators are the most energy-efficient type of refrigerator, using up to 20% less energy than top-freezer refrigerators.

Window air conditioners are not a type of energy-efficient air conditioner. Central air conditioners, portable air conditioners, and ductless air conditioners are all types of energy-efficient air conditioners.

To save energy when using an air conditioner, you should set the thermostat to a higher temperature, use a ceiling fan to circulate air, and close curtains and blinds during the day.

Furnaces are not a type of energy-efficient heating system. Heat pumps, geothermal heat pumps, and boilers are all types of energy-efficient heating systems.