1. How much electricity is consumed per hour? Consider an average room size of 100m2 . The heated area is approximately 80%, or 80m2 .In the case of the 150W mats, when the heater is ON, the hourly consumption is 1500W times 80m2.When the recommended thermostat is turned on, take 100m2 as an example. The room is filled with heat about 20min~30min, which is between 450W and 750W.Of course, the specific cost depends on your electricity consumption and electricity unit price. 2. Do I use insulation materials? We recommend that you use insulation materials. On the one hand, it is for your safety considerations, on the other hand, because it can lock the heat, the preheating will be faster, and the power consumption will be reduced. 3. Is it safe to use in a humid place? Yes, our products are of high quality and have a grounding wire. 4. How long is the warranty time? 25 years for heating cable & heating mat.2 years for for constant wattage/self-regulating heating cable and thermostats. 5. Can I crop it? Yes, you can crop the grid 6. What is the thickness of the cable?The cable is 3.5mm thick. 6. What is the thickness of the cable? The cable is 3.5mm thick.