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Central vacuum systems also started to become popular among European consumers interested in their hygienic and convenience benefits. By the 1990s, central vacuum systems gained popularity among real estate agents and home remodelers for the value they added to homes at resale.
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A drawback is the installation cost, which can be slightly higher than traditional HVAC systems. Energy efficiency can be improved even more in central heating systems by introducing zoned heating. This allows a more granular application of heat, similar to non-central heating systems. Zones are controlled by multiple thermostats.
Digital calculator, computer: Still used as an exercise; mechanical calculators sometimes still used for calculations while travelling at high speeds. Vacuum tube: Transistor: Vacuum tubes are still used in microwave ovens, RF communications and radar, high power industrial switching such as in pulsed lasers and generation of x-rays.
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