Yup if you have a smaller Generator like a 5000 watt then you only run the breakers you need to. You can swap them too of you had to do laundry, turn of the AC for a hour while you do it. I figure my lights, plugs in one room, my furnace is Gas but has a ignition and blower then the fridge/chest freezer.. I could do that easy with 7800 watts. Thats whats so cool is that it sends the power in to your Breaker Box just like regular Power. When the Power comes back on it has a Flashing Light to let you know.
Its a good idea Im surprised it isn't advertised more.