What is the purpose of an economizer in HVAC operations?

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Multiple Choice

What is the purpose of an economizer in HVAC operations?

An economizer is about using outside air to meet part of the cooling and ventilation load when conditions outside are favorable. When the outdoor air is cool and acceptable in humidity and quality, the economizer opens to bring in more outside air, which reduces the need for mechanical cooling and saves energy—the idea of “free cooling.” This improves efficiency because the system uses outside air to help condition the space rather than always relying on the refrigerant coil. It’s not primarily about heating return air or about filtering outside air—that happens separately in the system. Humidity and air quality protections are still needed, so controls prevent outdoor air introduction if conditions aren’t suitable.

An economizer is about using outside air to meet part of the cooling and ventilation load when conditions outside are favorable. When the outdoor air is cool and acceptable in humidity and quality, the economizer opens to bring in more outside air, which reduces the need for mechanical cooling and saves energy—the idea of “free cooling.” This improves efficiency because the system uses outside air to help condition the space rather than always relying on the refrigerant coil.

It’s not primarily about heating return air or about filtering outside air—that happens separately in the system. Humidity and air quality protections are still needed, so controls prevent outdoor air introduction if conditions aren’t suitable.

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