About 90 percent of the energy used to wash clothes goes to heating the water. Assuming you already wash half your laundry in cold, moving the other half from hot to warm can save a substantial amount of energy.
Washing laundry in hot water is unnecessary as advance in clothes washers and laundry detergents have made it possible to get white and colored clothes perfectly clean in cold water. Except when washing particularly tough stains, such as oil, even load of laundry done in hot water wastes energy.
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