What is an economizer?
Economizers are primarily used on Commercial Rooftop Equipment. During mild outdoor weather in the Spring and Fall many commercial spaces still require air conditioning. The heat generated by lighting, computers and office equipment can make it hot inside even when it is 45-70 degrees outside. An Economizer senses the temperature and humidity level of the outdoor air. If the air is cool and dry enough for air conditioning use then the compressor is not used to cool the space. Instead, an opposed blade damper simultaneously closes off the return duct and opens a damper to the outside air. By doing this you are not paying to mechanically cool the space. You’re simply using the system fan to pull in cool, dry outdoor air for free! These accessories typically save 10 to 15 percent on annual cooling costs. If you are replacing your rooftop unit, and will be using the space for two years or more an economizer is a good way to offset rising utility costs.
