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  2. Is Central Air Worth the Cost? Plus, What You Can Do Instead

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    Health. Home & Garden

  3. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...

  4. Glossary of HVAC terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_HVAC_terms

    A transfer of fluid volume per unit time. fresh air fan Abbreviated FAF. fresh air fraction Fresh air fraction quantifies action of the economizer, and is defined by (Mass flow rate of fresh-air / Total air flow rate). Abbreviated faf. fresh air intake An opening through which outside air is drawn into the building.

  5. 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.

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  7. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]

  8. Operating expense - Wikipedia

    en.wikipedia.org/wiki/Operating_expense

    An operating expense (opex) [a] is an ongoing cost for running a product, business, or system. [1] Its counterpart, a capital expenditure (capex), is the cost of developing or providing non-consumable parts for the product or system.

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