Cannabis enjoys a similar temperature as humans, so if you find it too cold or too warm, chances are so do your plants. Optimal grow temperature is around 24°C. Under most conditions, room temperature is controlled by a thermostat, but if you have lighting that gives off heat, you may need to find alternative ways to lower the temperature of your grow area. Ventilation plays a key role in controlling the temperature of your grow area. If you want to cool the space, opening a window or venting in fresh air can help to lower the temperature. If you have trouble lowering the temperature, you may want to find a cooler space in the house. If your grow area runs lower than 24°, you may want to invest in a small space heater. Heaters can be used in conjunction with climate controller to moderate the temperature of your room. JUMP TO TEMPERATURE CONTROL