Tackling Old Windows: My Weekend Project Went Better Than Expected

Interesting you mention the bathroom and kitchen - those are exactly where I notice condensation first too. In my place (built in the 40s), the bathroom window basically fogs up every time anyone showers, even with the fan running. I’ve always wondered if I should seal that window more tightly, or if that would just make things worse by trapping even more moisture. Have you ever tried using a dehumidifier in those rooms, or do you just rely on the exhaust fans?

On the whole “stale air” thing, I get what you’re saying about needing to crack a window now and then. I’ve tried weatherstripping in a few different rooms, but sometimes it almost feels like the house gets stuffy, even in winter. Makes me wonder - how do folks strike that balance between energy savings and not having everything feel closed-in? Is it just a matter of opening a window every so often, or is there a better way to keep air moving?

Also, for anyone who’s used those bronze strips: did you find them tricky to install around old, uneven frames? Mine aren’t exactly square anymore... I had to improvise a bit and I’m not sure it’s as tight as it could be.

Curious if anyone’s found a sweet spot for keeping drafts out without inviting mold or that damp smell. Does it come down to the type of insulation, or is ventilation more important in old houses?

Mine aren’t exactly square anymore... I had to improvise a bit and I’m not sure it’s as tight as it could be.

Totally get where you’re coming from on the old frames. I ran into the same issue in my 1950s place - nothing is straight, and bronze strips don’t always want to cooperate. I found that using a small block of wood to press them in helped, but sometimes you just have to accept a little imperfection. Honestly, a slightly loose fit beats jamming them so tight you can’t open the window.

About the condensation: sealing up the window too much can backfire, especially in humid spots like bathrooms. A dehumidifier helped me more than just relying on the fan, especially during colder months when opening a window isn’t ideal. It’s a pain to empty it all the time, but less so than dealing with peeling paint or mildew.

I’ve noticed that ventilation ends up being more important than insulation in these older houses, at least for keeping things dry and fresh. There’s no perfect answer - sometimes I just crack a window for ten minutes after a shower and call it good enough. You’re definitely not alone trying to strike that balance.

I get what you’re saying about not sealing up too tight, but honestly, I think most old houses are leaky enough that a little extra insulation never hurts. I actually went the opposite way - sealed every gap I could find with weatherstripping and caulk, even in the bathroom. Haven’t had any major condensation issues, probably because the fan gets a real workout. For me, the savings on heating outweighed worrying about a bit of moisture. Maybe it’s just different climates or habits, but I’d rather deal with a dehumidifier than drafty rooms all winter.

I actually went the opposite way - sealed every gap I could find with weatherstripping and caulk, even in the bathroom. Haven’t had any major condensation issues, probably because the fan gets a real workout.

That’s pretty much what I did too, though I left a couple of “mystery drafts” under the stairs just in case. My house is 1920s and it’s basically a sieve, so honestly, sealing up the windows made a huge difference. I do notice a bit more condensation on the coldest days, but nothing a quick wipe or running the fan can’t handle. For me, the comfort of not feeling that icy breeze at 2am was worth it.

Funny you mention “mystery drafts” - I swear my house has a few of those too, and I’ve never figured out where they’re coming from. Every winter I go on a draft-hunting mission with a candle, thinking I’ll finally solve it, and every year I just end up moving the furniture around and giving up. My place is 1935, so it’s got that same “optional insulation” vibe as yours. I did the whole window-sealing routine last fall: weatherstripping, caulk, even the plastic film on the worst offenders. It’s not glamorous, but wow, what a difference in comfort.

I did get a little paranoid about trapping too much moisture. First winter after sealing everything up, I started noticing condensation on the bedroom windows - nothing wild, but enough to make me wonder if I’d overdone it. Ended up running the ceiling fan on low almost all winter. Not sure if that’s the “right” solution but it mostly worked... plus, bonus white noise for sleeping.

I have to laugh at how many folks say “just replace the windows.” Sure, if you’ve got a spare ten grand lying around. For now I’m happy with my patchwork approach and a couple of towels for backup on those really cold mornings.

Has anyone tried those old-school draft snakes? My grandma used to swear by them but I haven’t had much luck - maybe my drafts are just sneakier than hers were.

I get the appeal of patching things up, but honestly, sometimes all that weatherstripping and plastic film is just a short-term fix. Over time, those old windows can actually cause more headaches - think rot, mold, or even damaging your sills. I know replacement costs sting (seriously, who has that kind of cash?), but if you ever notice soft wood or persistent condensation, it might be worth looking at inserts or just replacing a couple of the worst windows first. Draft snakes are fine for doors in my experience, but windows... they’re just too tricky for those to do much good.

I’ve wondered about this too, especially since my place has those old single-pane wood windows. I tried the plastic film last winter - helped a bit, but yeah, the condensation just pooled up and made the sills even softer. I read that once you’ve got soft spots or visible mold, patching is kind of like putting a band-aid on a leaky pipe. Inserts seem interesting though... less invasive than full replacements and maybe more budget-friendly? Still not sure how well they insulate compared to modern double-pane units.

Yeah, I hear you on the condensation - mine got so bad last year I had to sand and repaint half the sills. Inserts do seem like a smart middle ground, but I’m still not convinced they seal as tight as new double-pane windows. At least they don’t wreck the old trim, which is a plus if you care about keeping the look. If you end up trying inserts, let us know how they hold up through a real cold snap... I’m tempted but still on the fence.

- Totally get your hesitation about inserts vs. full replacement.
- I did inserts in my 1920s place last winter - main reason was saving the original trim, just like you said. The look is still spot on, but I’ll be real, they’re not *quite* as airtight as modern double-panes. Still, way better than the old single glass.
- Condensation’s a lot less of a problem now, but I do still get a bit around the edges during those deep freezes. Not enough to peel paint, thankfully.
- Install was quick (just a couple afternoons), and I didn’t have to touch any of the weird old woodwork, which was a huge relief.
- Price-wise, inserts were a lot more doable than tearing everything out and starting over.
- If you’re on the fence, maybe test one or two windows before going all in? That’s what I did - helped me see if it was worth finishing the rest.
- Not perfect, but for me it was a solid compromise between cost, hassle, and keeping that old house character.

That’s really helpful, thanks. Did you notice any drafts or cold spots after the inserts went in, or was it just the condensation around the edges? I’m curious if you had to add extra weatherstripping or anything after the fact.

Did a bunch of these last winter in an old Craftsman. Once the inserts were in, drafts dropped off a ton - honestly, no real cold spots unless you stood right up next to the glass on a windy day. The only spot I noticed condensation was along the bottom edge, but nothing major. I skipped extra weatherstripping at first, but after a couple weeks I added a thin foam strip on one window that had a stubborn gap. Sometimes you don’t know till you live with it for a bit. Sounds like you’re on the right track.

That sounds really familiar - I had almost the exact same thing happen with a couple of my old double-hungs. After putting in the inserts, it was like night and day for drafts. I was honestly surprised by how much warmer the rooms felt, especially since I’d been skeptical about how much difference they’d actually make.

Did you notice any noise reduction too? For me, street noise dropped off a bit, which was a nice bonus. The condensation along the bottom edge is interesting... I got a little of that too but only when it was super cold outside. Never turned into anything more than a bit of fogging.

I held off on extra weatherstripping at first as well, thinking maybe I could get away without it. Ended up adding some on two windows after a few weeks - just like you said, sometimes you don’t spot every gap until you’ve lived with it for a while.

It’s always a bit of trial and error with these old houses, but it sounds like you’re making all the right calls. Curious if you ran into any surprises during install?

Funny you mention surprises - installing inserts always seems straightforward until you start. I ran into a couple of stubborn sashes that weren’t square, so the fit was tighter than I’d like. Had to shave a bit off the stops, which I wasn’t expecting. Honestly, noise reduction was hit-or-miss for me. On one side of the house, it helped a lot, but the other side still lets in some traffic rumble. I’m honestly not convinced they’re a cure-all, but the draft reduction is hard to argue with. Curious if you had trouble with the old pulleys or weights? Those can be a pain.

Yeah, those old pulleys can be a real headache - sometimes they come right out, sometimes you’re cursing under your breath for half an hour. I’ve had to patch up a few weight pockets that were just crumbling too. Did you end up leaving the weights in or pulling them all?