 somewhere in the house where you can disconnect it manually just from inside the house. Those are all code requirements, and you go from there. The electric ones are thermostatically controlled. So there's a dial on there. You can adjust it with a screwdriver that it will turn on when the attic gets to a certain temperature, and it'll turn off when the attic gets back down below that temperature. So that's kind of nice. That's what we had for years.