Eli5: How do building central cool/heat work?

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I’m living in a high rise building with central air, and they switch the entire system from heating in winter to cooling in summer. We have a thermostat, but I’m not sure it does anything. It’s usually too hot or cold, all I can do is turn off the unit or play around with the fan speed.

Do you think there’s a shaft the sends hot or cold air depending on the season up my entire building and my unit turns on a fan to pull in some of that air if needed? Why is my unit always too cold or too hot and adjusting the thermostat doesn’t don much?

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4 Answers

Anonymous 0 Comments

It may depend on the specific building but when I lived in a high rise the system was water based. There was a boiler and a chiller in the basement that warmed or cooled water sent through pressurized pipes running through the HVAC units in each unit. The units then had fans that allowed us to control air speed blowing across the insides that had the hot or cold water running through.

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