Frigidaire
Manufacturer of highly eco-efficient appliances, designed to operate quietly. Made in Sweden for the U.S. market.

Maytag
Their horizontal-axis Neptune washing machine uses less energy and 40% less water than the average traditional machine. They also make other appliances such as eco-efficient refrigerator/freezers.

Miele Appliances
High efficiency appliances: dishwashers, clothes washers, dryers, and vacuums.