I have a Model 3 and live in Massachusetts. It’s cold out, sometimes rainy or snowy still. I’m going away next week for a week. I’ve just been using a nearby supercharger, though once I used an extension cord to my house 120v outlet just to see how it worked (it did). So, should I leave my car plugged into the 120v or leave it unplugged? I plan on getting a 240v outlet outside in he spring. I know an extension cord isn’t good. Thanks for any help!