Keeping the heat in without cranking up the thermostat

I was skeptical about thermal curtains too, but honestly, they surprised me. I didn't see a huge drop in my heating bill, but comfort-wise, the difference was noticeable—especially near my drafty old windows. Mine aren't super thick or heavy either; they're just lined with a thermal backing. Definitely doesn't look like Dracula's lair, lol. Tried the window film kits once...they worked okay, but installing them neatly was kind of a pain.