What is the function of an economizer in HVAC systems?

• A. To reduce humidity levels
• B. To use outside air for cooling
• C. To increase heating capacity
• D. To filter indoor air

Answer: (B)

The specific function of an economizer in HVAC systems is to utilize outside air for cooling when conditions permit. This process is also known as “free cooling.” By bringing in fresh, cooler outside air, the system can reduce reliance on mechanical cooling methods, such as compressors, leading to energy savings and improved efficiency. The economizer controls the mixture of outside air and return air to optimize the indoor climate, especially during transitional weather when outside temperatures are low enough to cool buildings effectively.

In many modern HVAC systems, economizers enhance energy efficiency by allowing the system to operate less frequently or at lower capacity, reducing overall energy consumption and costs. They are particularly beneficial in climates where outside temperatures are conducive to cooling most of the year.