Perhaps you sleep better in the cold. Maybe you get hot easily. You may just even enjoy watching your breath fog in chilly climes. Whatever the reason, if you're having guests over for the holidays, you need to turn up the heat, even if the thought of the post-Christmas electric bill chills you to the core.
Your visitors don't appreciate being forced to live in a makeshift ice hotel, regardless if their stay is on the house. Keep cranking up the heat until the constant sound of chattering teeth is silenced and people take off a few of their layers. Your gas or electric company may advise you to keep the inside temp at a cool 68 degrees Fahrenheit, but you're going to have to adjust the thermostat for your guests' comfort.
Once the holidays are over, you can go back to your frosty ways. But for now, keep the house at a reasonable temperature (somewhere in the low 70s), even if it isn't your ideal setting.