The HVAC Automatic Control is a lesser-known element of HVAC systems. The HVAC economizer can greatly reduce your energy costs. One of the most power-hungry systems at your site is probably the HVAC system. Using indoor and outdoor temperature sensors as well as built-in logic and math functions, the Cortex Series units can be configured to create an economizer function for your system. If your indoor temperature isn’t too high, and the outdoor temperature is cool enough, an economizer will allow your refrigerant-based AC to take a break while the outdoor air does most of the cooling work.