What is the purpose of using economizers in HVAC systems?

The function of economizers in HVAC systems is primarily to utilize outside air for cooling. Economizers take advantage of favorable outdoor conditions, allowing systems to draw in outside air when it is cooler than the return air from the indoor space. This process reduces reliance on mechanical cooling, thereby lowering energy consumption and improving overall efficiency.

Using outside air for cooling is particularly effective during transitional seasons or in climates where nighttime temperatures are cooler. This method can significantly lower operational costs while maintaining comfortable indoor temperatures. The design and control of economizers are crucial for maximizing their effectiveness in optimizing thermal comfort and energy use.

The other choices reflect functions that do not align with the primary purpose of economizers. Recycling indoor air is more related to ventilation strategies, increasing heater capacity focuses on heating systems rather than cooling, and extending equipment lifespan while beneficial is not the main function of economizers.