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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   During winter months, for example, an air conditioning register can be closed to prevent cold air from being pulled from the room. This allows the hot air to mix more completely with the cold air in the room, improving the efficiency of the HVAC system. [7] (The return should be efficient enough to draw off the cooler air.) [10] [11]

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air. [37] The first inverter air conditioners were released in 1980–1981. [38] [39]

4. Fan coil unit - Wikipedia

   en.wikipedia.org/wiki/Fan_coil_unit

   These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

5. Can cold weather make you sick? Your grandma wasn't entirely ...

   www.aol.com/cold-weather-sick-grandma-wasnt...

   That also happens with air conditioning, which can reduce humidity. “That opens up a wider window of time that you could potentially get infected if you walk into a room, or if you touch a ...

6. Oldest stone tablet inscribed with Bible’s Ten Commandments ...

   www.aol.com/oldest-stone-tablet-inscribed-bible...

   The oldest known tablet inscribed with the Ten Commandments from the Old Testament sold on Wednesday for $5.04 million, more than double its high estimate. The stone, which dates back around 1,500 ...

7. Fluctuating blood pressure could influence cognitive decline risk

   www.aol.com/fluctuating-blood-pressure-could...

   Fluctuating blood pressure in older men — particularly older Black men — is tied to a heightened risk of cognitive decline. Image credit: MoMo Productions/Getty Images.