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2. Tips to find the best air purifiers to protect against L.A ...

   www.aol.com/news/tips-best-air-purifiers-protect...

   Here's what the air quality experts had to say. Cheap doesn't mean bad The good news is Angelenos need not break the bank on these purifying devices — the cost of which can range anywhere from ...

3. No, You Don't Need to Clean Your Air Ducts Every Year—Experts ...

   www.aol.com/no-dont-clean-air-ducts-110500245.html

   Cunniffe summarizes that according to the US Environmental Protection Agency (EPA), you should only clean your air ducts on an as-needed basis because experts often debate the perceived benefits ...

4. 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 ...

5. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

6. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   A heat pump is the central unit for the building's heating and cooling. It usually comes in two main variants: Liquid-to-water heat pumps (also called water-to-water) are hydronic systems that carry heating or cooling through the building through pipes to conventional radiators, underfloor heating, baseboard radiators and hot water tanks. These ...

7. Health Experts Explain Why You Should Avoid Window AC Units ...

   www.aol.com/health-experts-explain-why-never...

   Health experts and home engineering pros share how air conditioning may help improve indoor air quality when air quality indexes are bad, and when to not use ACs.