You need a Control Meter to control the cooling, heating, and the watering systems of your indoor garden.
You can do this with a easy-to-use controller for air conditioners and exhaust fans or go up to a 12 Light Commercial Controller for your Grow System. This depends upon how big of a grow you have and how much you want to invest.. Simply plug this environment control meter into a power receptacle and then plug your cooling devicies into its outlet Choose your preferred room temperature set point with the rotary knob. When this meter's built-in sensor senses that the room temperature has exceeded the set point by at least 1°F, it will automatically activate your cooling device by powering the outlet. This meter runs about $40.00+ shipping, and is a single unit outlet
There are other meters like the commercial twelve light environment controller features an integrated time delay to "soft start" each bank of 4 lights (5 min delay between banks), reducing the start-up load. there units will run around $450.00 + shipping.
So depending upon how big your grow is and how many Grow Lights, Exhaust Fans, Watering Systems, and how much you want to invest in a Meter (timers). The environment controller is a must in the control of your indoor garden enviroment to increase the plant production, health, and quality of indoor gardening efforts.