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2. American Residential Services - Wikipedia

   en.wikipedia.org/wiki/American_Residential_Services

   American Residential Services (ARS) is a United States network of plumbing, and home and commercial heating and air conditioning businesses, operating under the trade name ARS/Rescue Rooter. The trade name came from the acquisition and merging of ARS and Rescue Rooter by their then-parent company ServiceMaster .

3. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   Where coal was readily available (i.e. the anthracite coal region in northeast Pennsylvania in the United States) coal-fired steam or hot water systems were common. Later in the 20th century, these were updated to burn fuel oil or gas, eliminating the need for a large coal storage bin near the boiler and the need to remove and discard coal ashes.

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning, often abbreviated as A/C (US) or air con (UK), [1] is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and in some cases also controlling the humidity of internal air.

5. AOL Mail

   mail.aol.com/d?reason=invalid_cred

   AOL Mail is free and helps keep you safe. From security to personalization, AOL Mail helps manage your digital life Start for free

6. Thermal expansion valve - Wikipedia

   en.wikipedia.org/wiki/Thermal_expansion_valve

   A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible.A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator.

7. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   For example, an air-to-water heat pump that produces 6kW at a SCOP of 4.62 will give over 4kW of energy into a heating system for every kilowatt of energy that the heat pump uses itself to operate. When used for space heating, heat pumps are typically more energy-efficient than electric resistance and other heaters.