Heat pumps are like smart heaters that also can cool your home or building. Instead of burning fuel to make heat, they moves heat from one place to another one. In winter, they grab heat from outside air, even its cold, and bring it inside for warming you up. In summer time, they do opposite, take heat from inside and push outside to cool down. This make them super saving-energy because not creating heat new; just moving it. So they uses less electricity than normal heater or AC, which good for your bills and planet. windfull makes these smart system that keep you comfy all year.