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2. Here’s What Building a House Actually Costs Today - AOL

   www.aol.com/much-does-actually-cost-build...

   Those numbers are higher than they were last year, when Home Advisor put the average cost to build a house in the U.S. at $293,542. They also don’t include the cost of land. Anecdotally, we’re ...

3. Packaged terminal air conditioner - Wikipedia

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

   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 1935, and was designed to fit under a window like many modern PTACs.

4. Glossary of HVAC terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_HVAC_terms

   Glossary of HVAC terms. HVAC (heating, ventilation, and air conditioning) is a major sub discipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized ...

5. 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.

6. Allergic to Air Conditioning? It’s What’s in the Air

   www.healthline.com/.../allergic-to-air-conditioning

   Biological contamination can cause allergic reactions, including hypersensitivity pneumonitis, allergic rhinitis, and asthma. In large buildings, toxins released by microorganisms that live in the ...

7. What Air Conditioning Does to Your Body - WebMD

   www.webmd.com/a-to-z-guides/ss/slideshow-what-ac...

   1 /12. If you work in an air-conditioned building with poor ventilation, it can raise your risk of “sick building syndrome.”. Symptoms include headaches, dry cough, dizziness and nausea ...