The struggle to keep warm is real, especially when temperatures start to dip below freezing. No one knows this better than the citizens of cold climates. But what’s the best way to deal with the chill? Is having a programmable thermostat worth it? Do heavy-duty curtains really curtail the cold? We asked our frigid-weather friends for their best tips on staying toasty indoors when winter is in full force. And no, moving to Miami, FL, wasn’t one of them — though that’s not a bad idea.