The only downside is they fog up sometimes if you don’t vent them right, but I’d take that over shivering any day.
Yeah, fogging is the one thing that bugs me too. I did something similar last winter—used polycarbonate sheets and just wedged them in with some foam tape. Not as fancy as magnets but it worked. The difference was night and day. My old farmhouse windows used to whistle every time the wind picked up, now it’s just quiet and actually feels like the heat stays inside.
I will say, I tried weatherstripping everything before building the interior storms and honestly, it helped a little but didn’t come close. The storms are way better for blocking those weird drafts you can’t even see. But like you said, if you get lazy with sealing or don’t leave a tiny gap at the bottom, you get that condensation build-up. I forgot to crack one open for a few days and ended up with water pooling on the sill... not great.
One thing I noticed, too—if you use clear acrylic or poly sheets instead of glass, it scratches easier when you clean them. Not a huge deal unless you’re picky about looks. But for an off-grid cabin where function matters more than style, it’s kind of perfect.
I still have to swap them out in spring because they make opening windows a pain, but honestly, worth the hassle for how much warmer the place stays. Way cheaper than replacing all the old windows, that’s for sure.
I hear you on the condensation. I tried those shrink-wrap window kits a couple years back—cheap and easy, but they only lasted one season before tearing. Ended up making my own storms with plexiglass and some old weatherstripping I had lying around. Not pretty, but it kept the drafts out and I barely needed to run the wood stove as much. Only downside was cleaning—those plastic sheets picked up every little scratch and smudge. Still, for an old place like mine, it beat spending thousands on new windows.
- Plexiglass storms do block drafts, but they trap moisture if not sealed just right. Seen a lot of rot in old frames because of that.
- Cleaning and scratching is a pain, like you said. Glass is tougher, but yeah, way pricier.
- For older cabins, I usually suggest rigid foam board cut to fit inside the frame—doesn’t look great but insulates well and pops out for ventilation.
- Those shrink kits are hit or miss. If you do go back to them, adding a bead of silicone around the edge helps them last a bit longer.
- Not everyone’s up for it, but sometimes just adding thick curtains or even wool blankets at night does more than folks expect.
I’ve tried the rigid foam board trick too—works alright but, yeah, it’s not exactly pretty. I always wonder about the air quality though, especially if you’re sealing things up tight for winter. Anyone ever notice musty smells or condensation building up when you go heavy on insulation?
I always wonder about the air quality though, especially if you’re sealing things up tight for winter. Anyone ever notice musty smells or condensation building up when you go heavy on insulation?
I’ve definitely run into that. The first winter I went all-in with foam board and heavy caulking, I thought I was a genius—until about January, when the whole place started smelling like wet socks. Turns out, sealing everything up is great for heat, but if you don’t have some way for air to move (even just a cracked window now and then), you’re asking for trouble. I actually had condensation dripping down the inside of my windows one morning... not a fun surprise.
Honestly, sometimes I think people get so focused on R-values and stopping drafts that they forget you still need a bit of fresh air coming in. Otherwise, you’re just trapping moisture and stale air. I started using those little trickle vents—nothing fancy, but it helps balance things out. Not perfect, but better than peeling mold off the window frames in March.
- Totally agree, air quality can take a hit if you go overboard with sealing.
- I’ve seen similar issues—condensation on windows, that damp smell, especially after a few weeks of really cold weather.
- Ventilation’s key, but it’s easy to forget when you’re focused on keeping every bit of heat in.
- I tried a cheap humidity monitor last winter and was surprised how fast moisture built up inside.
- Trickle vents are a decent fix, but I’m still looking for a better balance. Maybe some kind of DIY heat recovery vent? Not sure if it’s worth the hassle for a small cabin...
- Anyway, insulation’s great, but yeah—fresh air matters more than most people think.
Had a job a couple winters back—small off-grid place, client wanted it airtight to save on firewood. We went all-in on insulation and double glazing, but within a month, the windows were foggy and there was that musty smell. Ended up putting in a couple trickle vents and a basic bathroom fan on a timer. Not perfect, but way better than dealing with mold. Heat recovery’s great in theory, but honestly, in cabins under 400 sq ft, sometimes low-tech is just less hassle.
“Heat recovery’s great in theory, but honestly, in cabins under 400 sq ft, sometimes low-tech is just less hassle.”
Totally get where you’re coming from. I’ve seen a lot of folks chase the “airtight” dream and end up with that same musty vibe. Sometimes a couple well-placed vents and a cheap fan do more good than any fancy HRV setup—especially when you’re off-grid and every watt counts. It’s always a balancing act between warmth and fresh air... sounds like you found a pretty solid middle ground.
Sometimes a couple well-placed vents and a cheap fan do more good than any fancy HRV setup—especially when you’re off-grid and every watt counts.
That hits home. I tried the “super-sealed” thing in my old 350 sq ft cabin, thinking I’d save on firewood and keep drafts out. Instead, I got windows sweating like crazy and this weird smell that just wouldn’t go away. Ended up cracking a window most nights anyway, which kind of defeated the whole “airtight” plan.
Swapped out the single-pane windows for double-pane inserts last winter, and honestly that made a bigger difference than any gadget. Less condensation, way less drafty, and I don’t wake up feeling like I’m in a sauna anymore. Still need to run a little fan now and then, but it’s not a big deal.
I get the appeal of all the high-tech stuff, but in these tiny places, sometimes simple just works better. Plus, less stuff to break when it’s -20 and you’re half-asleep trying to fix something with mittens on...
I got windows sweating like crazy and this weird smell that just wouldn’t go away.
Yeah, sealing things up too tight is a recipe for funky air. I learned the hard way too—thought I was being clever with all the caulking and weatherstripping, but ended up with mildew behind the couch. A small fan and just letting the place breathe works better than any fancy system for me. Double-pane windows are definitely worth the splurge though, especially when you’re tired of scraping ice off the inside glass every morning. Simple fixes just seem to last longer out here.