Some, but not all, washer and dryer combination units can be just as efficient as stand-alone washers and dryers. It is estimated that a family of four can save about $100 a year with these machines when compared to other washers and dryers.
What makes these machines more efficient is the smaller size, reduced hot water usage and the mechanics of the washer. In many cases, the washer spins very quickly, as much as 1,000 revolutions per minute. This helps to suck more water out of the clothes, helping them dry faster. There are ways that a homeowner can maximize the efficiency of a combination washer and dryer, too. For instance, making sure that the machine is not overloaded helps to keep energy costs low.
For the best energy efficiency, it is recommended that homeowners look for machines that meet both Energy Star and the Consortium for Energy Efficiency standards. When buying a combination washer and dryer, it is also recommended that buyers look at the EnergyGuide label that is affixed to each machine. These labels are required by law and ell the consumer the rating of the unit's energy use when compared to other washing machines. The label also tells a consumer the approximate operating cost; however, the exact cost depends on the cost of utilities.