Climate controllers for indoor growing. These devices let you keep temperature and humidity under control. Controllers are in charge of switching HVAC (Heating, Ventilation + Air Conditioning) elements (such as extractors or A/C devices) on and off to keep the preset temperature and humidity levels nice and stable.
Cornwall Controllers allow you to regulate the temperature in your grow by connecting it to a heater or an air conditioning unit and dialing it to the desired temperature. Humidity controllers allow you to do the same, controlling moisture levels by being connected to a humidifier or dehumidifier. You can also regulate the temperature to which your plants are exposed thanks to the HVAC system if the air you are taking in is fresh. The drawback of these controllers is that the temperature reading is made at the location of the plug, so you will have to place them where you wish to take readings.
GSE controllers are of a higher quality. It's not really that they are better, but they do come with a probe which lets you take readings at any point of the garden and not just at the location where the device (and the plug) is located. In this section you can find a different controller for each parameter: Humidity Controller, Temperature Controller, Low Pressure Temperature Controller or Max and Min Hysteresis Speed Temperature Controller. There is also one controller which measures everything: the GSE Controller of Temperature and Humidity & Negative Pressure and Hysteresis.
Some controllers such as CIi-Mate have other functions besides controlling your extractors to regulate growing temperature. For instance, they let you choose the maximum speed you want the extractors to work at and also the minimum one, so that they don't make that "electrical noise" or the extraction switches off (with the potential risk odor leakage). You can program up to four 600W lamps without worrying about your system burning or the timer blowing a fuse and ceasing to work. You can find all of the instruments needed to measure and control the parameters in your grow.
Other controllers that are progressively making their way through the market are the ones by SMS Com. They are truly good quality and highly affordable. You can find a power regulator that can stand many amperes, so that lowering the power of your bigger extractors will not longer be a problem. Also, by connecting the probe to your speed controller you can turn it into a temperature controller that will turn on or off the extraction system to meet your plants' needs.
Evolution Fan Controller is another well-known climate controller. All you have to do is connect your extractors to the controller and it will take care of keeping all humidity and temperature parameters. It features one of the best probes of all controllers since it doesn't need to be fine-tuned. You can connect your temperature controller to CO2 Evolution Controller and optimize your system.
If you keep humidity and temperature parameters under control your plants will thank you with better yields, providing you with compact hard buds, full of flavor.