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2. The best Black Friday deals we’ve found so far from Amazon ...

   www.engadget.com/the-best-black-friday-deals...

   The new Apple Watch Series 9 has dropped to $349 at Amazon and Walmart in an early Black Friday deal. That’s $50 off its usual price and the lowest we’ve seen since it debuted in September ...

3. The 60 best Black Friday deals you can get right now at ...

   www.engadget.com/the-60-best-black-friday-deals...

   Apple AirTags. Apple. Apple AirTag (4 Pack) $80 $99 Save $19. Save $20 on a four-pack of AirTags for Black Friday. $80 at Amazon. Explore More Buying Options. $100 at Verizon $105 at Groupon. A ...

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. [ 2][ 3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). [ 4] Heat pumps are similar in many ways to air conditioners ...

5. Willis Carrier - Wikipedia

   en.wikipedia.org/wiki/Willis_Carrier

   Willis Haviland Carrier (November 26, 1876 – October 7, 1950) was an American engineer, best known for inventing modern air conditioning. Carrier invented the first electrical air conditioning unit in 1902. In 1915, he founded Carrier Corporation, a company specializing in the manufacture and distribution of heating, ventilation, and air ...

6. Seasonal energy efficiency ratio - Wikipedia

   en.wikipedia.org/wiki/Seasonal_energy_efficiency...

   The energy efficiency ratio (EER) of a particular cooling device is the ratio of output cooling energy (in BTUs) to input electrical energy (in watt-hours) at a given operating point. EER is generally calculated using a 95 °F (35 °C) outside temperature and an inside (actually return-air) temperature of 80 °F (27 °C) and 50% relative humidity.

7. Evaporative cooler - Wikipedia

   en.wikipedia.org/wiki/Evaporative_cooler

   Porous pottery and coarse cloth maximize the area for evaporation. An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which use vapor-compression ...