The new store featured home appliances such as washing machines, clothes dryers, refrigerators, and grills. Some charge additional coverage for appliances such as clothes washers and clothes dryers. Compressed air dryers do not reuse drying air. Laundry drying was also mechanized, with clothes dryers. A laundromat (washeteria) has been built to serve the community with washers, dryers, and showers. An air conditioning unit and calcium chloride dryers were installed in the vault. Both types can be over twice as efficient as conventional tumble dryers. This allows faster drying, while using much less energy than traditional electrical hand dryers. Different scales apply for condenser and vented dryers. Electricity led to the development of permanent wave machines and hair dryers. There are various types of compressed air dryers. PET can also be dried in compressed air resin dryers. An estimated 5.3 million tumble dryers were bought in the UK over the time period. All humidity sensors face problems in measuring dust-laden gas, such as exhaust streams from dryers. Membrane air dryers depress the incoming dew point.