Top-freezer refrigerators are the most energy-efficient type because they have a smaller freezer compartment, which requires less energy to cool.

Air conditioners use the most energy in a typical household, especially during hot summer months.

The Energy Star rating system is a voluntary program that sets energy efficiency standards for appliances. Appliances that meet these standards are eligible to display the Energy Star label.

Variable speed compressors are an example of an energy-efficient feature found in some appliances, such as refrigerators and air conditioners. They can adjust their speed to match the cooling needs of the appliance, which can save energy.

Washing full loads of laundry is the most energy-efficient way to wash clothes because it reduces the number of loads that need to be washed.

Induction cooktops are typically the most energy-efficient cooking appliances because they use electromagnetic energy to heat cookware directly, rather than heating the air around the cookware.

Hanging clothes to dry instead of using a dryer is the most energy-efficient way to dry clothes because it does not require any electricity.

Soil sensors are an example of an energy-efficient feature found in some dishwashers. They can detect the amount of soil on dishes and adjust the wash cycle accordingly, which can save energy and water.

Cleaning the lint filter before each use is the most energy-efficient way to use a clothes dryer because it helps the dryer to operate more efficiently.

High-efficiency impellers are an example of an energy-efficient feature found in some washing machines. They can move water and detergent more efficiently, which can save energy and water.

Rinsing dishes before loading them into the dishwasher is the most energy-efficient way to use a dishwasher because it helps to remove food particles that can clog the dishwasher's filters and reduce its efficiency.

Linear compressors are an example of an energy-efficient feature found in some refrigerators. They can operate more efficiently than traditional compressors, which can save energy.

Using a ceiling fan to circulate air is the most energy-efficient way to use an air conditioner because it helps to distribute cool air more evenly throughout a room, which can reduce the need to lower the thermostat setting.

Variable speed compressors are an example of an energy-efficient feature found in some air conditioners. They can adjust their speed to match the cooling needs of the room, which can save energy.

Covering food while cooking in the microwave oven is the most energy-efficient way to use it because it helps to trap heat and moisture, which can reduce cooking time and save energy.