I’m in the middle of planning a reno for my 1970s semi, and I keep seeing ads for these slimline bifold doors. They look great, exactly the vibe I’m after, but I’m a little worried about how they perform in winter. Anyone here actually installed them? I’m not looking to freeze my toes off just to get more light in the living room. Do they make a real difference in keeping the place warm, or are they mostly hype? Any regrets or happy stories to share? I’d really appreciate some real talk before I blow my savings.