What is the main role of an economizer in HVAC systems?

The primary function of an economizer in HVAC systems is to utilize outside air in order to decrease reliance on mechanical cooling. This approach is particularly effective in improving energy efficiency. By allowing cool outdoor air to enter the system when conditions permit, the economizer reduces the overall demand for energy-intensive mechanical cooling methods. This not only lowers operational costs but also supports environmentally friendly practices by minimizing energy consumption.

In climates and situations where outdoor air is cool enough, an economizer can significantly reduce or even eliminate the need for air conditioning, allowing the system to take advantage of natural ventilation. By enhancing indoor air quality and comfort levels while decreasing energy costs, the implementation of an economizer adds substantial value to HVAC systems.

The other options do not align with the fundamental purpose of an economizer. Filtering indoor air pertains to the air filtration mechanisms in HVAC systems, humidifying the air involves adding moisture to combat dryness, and increasing indoor temperature is contrary to the cooling function that an economizer is designed to support.