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2. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The units went on sale in 1932 at US$10,000 to $50,000 ... This system is commonly used on mini-split air conditioners because it is simple and portable. Some window ...

3. The 7 best portable air conditioners on sale as the heat wave ...

   www.aol.com/news/8-best-portable-air...

   Shop these portable air conditioners on sale at Amazon. You'll find portable air conditioner deals from Whynter, Frigidaire, Midea and LG. The 7 best portable air conditioners on sale as the heat ...

4. Heating, ventilation, and air conditioning - Wikipedia

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

   Split systems are preferred and widely used worldwide except in North America. In North America, split systems are most often seen in residential applications, but they are gaining popularity in small commercial buildings. Split systems are used where ductwork is not feasible or where the space conditioning efficiency is of prime concern. [33]

5. Packaged terminal air conditioner - Wikipedia

   en.wikipedia.org/wiki/Packaged_terminal_air...

   Packaged terminal air conditioner installed in a residential apartment. A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in ...

6. Friedrich Air Conditioning - Wikipedia

   en.wikipedia.org/wiki/Friedrich_Air_Conditioning

   Floating Air Ductless Split Systems: These split-unit air conditioners are produced in both single and multi zones. ZoneAire: Multi-functional portable air conditioners that offer both de-humidification and heating (on select versions). They include auto swing louvers, self-evaporation condensation systems, and a dual zone design, which ...

7. Variable refrigerant flow - Wikipedia

   en.wikipedia.org/wiki/Variable_refrigerant_flow

   Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller-based systems.