Dealing with foggy windows: replace the glass or just reseal?

That’s honestly the dilemma, right? I’ve got a couple original windows left in my place and I keep waffling on whether to just bite the bullet and swap them out. The drafts are annoying, but I really like the old glass too - there’s something about how it distorts the morning light. I tried those shrink-wrap window insulation kits last winter and they helped a bit with the chill, but condensation was still a thing. Haven’t found a magic fix either... sometimes wonder if storm windows would be worth the hassle just to keep that old-school vibe without freezing.

I get the nostalgia for old glass - there’s something about the wavy reflections that just feels right, especially in the morning. But I keep wondering if we’re maybe overestimating how much those drafts and condensation are “just part of the charm.” I had a similar situation with my 1920s windows and tried the shrink-wrap kits too. They helped, but when it got really cold, I still felt like I was living in a wind tunnel.

Here’s the thing: I ended up going with interior storm windows, not full replacements. They’re kind of a pain to install the first time, but you keep the original glass and most of the look, plus they’re way less expensive than new windows. The tech on some of these is actually pretty cool - magnetic seals, custom fits, and they pop out easily when you want fresh air. I was skeptical at first, but condensation dropped a bunch and my heating bill didn’t make me cry this winter.

I know people say new windows are always better for energy, but I’m not totally convinced it’s worth the cost unless your frames are rotted or you’ve got major leaks. Plus, there’s the landfill issue - tossing out perfectly good wood frames just feels wrong if you can avoid it.

Curious if anyone else has tried those interior storms long-term? I’m still not 100% sold on the look, but it’s been a decent compromise so far. Also, has anyone found a good way to cut down on condensation without losing ventilation? That’s the one thing I haven’t totally solved...

I get the appeal of keeping the old glass, but honestly, I tried the interior storms for a couple years and eventually got fed up. They worked okay for drafts, sure, but I still had condensation issues - especially in the corners. Plus, cleaning is a pain when you have to pop them out every time. In my case, I finally bit the bullet and just had the sashes rebuilt and the original glass properly re-glazed and weatherstripped. Not cheap, but it actually solved more problems than the storms ever did. Sometimes, just resealing and restoring what’s there is more effective than adding another layer.

I hear you on the hassle with interior storms. They’re a quick fix, but long-term, you end up dealing with the same headaches - condensation, tricky cleaning, and sometimes even more drafts if they’re not seated right. Re-glazing and weatherstripping original sashes is usually the best route for old windows, especially if you want to hang onto the character. It’s not cheap, but it’s a one-and-done solution for most issues.

That said, I’m curious - when you had condensation in the corners, was it mostly in winter, or did you notice it year-round? Sometimes that points to a bigger ventilation problem in the house, not just the windows themselves. I’ve seen cases where people spent a fortune on new glass or storms and still had fogging because of humidity buildup inside.

In my experience, resealing works if the glass is still solid and you’re not dealing with failed double panes. Once the seal in an IGU (insulated glass unit) goes, though, you’re pretty much stuck with that foggy look unless you replace the glass. Single-pane windows are a different story - you can almost always salvage them with fresh putty and some patience.

Curious if anyone’s tried those “defogging” services where they drill into the glass and suck out the moisture? I’ve never seen one actually last more than a year or two before it fogs up again… seems like a band-aid fix at best.

If you’re dealing with old wood windows, sometimes restoring and weatherstripping gives you 90% of the benefit of full replacement, especially if you don’t mind a little maintenance now and then. But yeah, nothing beats the look of old wavy glass once it’s cleaned up and sealed tight.

Did you notice any difference in your heating bills after doing the sash rebuild? Sometimes folks expect miracles and only see a small change - just curious how it played out for you.

You nailed it with the point about ventilation - sometimes, people get hyper-focused on the window itself and overlook that bigger picture. I ran into something similar in my 1930s bungalow. I did a full sash rebuild and added proper weatherstripping, hoping for a big drop in heating bills. The comfort improved a lot - no more drafts around the windows - but honestly, the energy savings were modest. Maybe 10% off my winter bill, tops. Still, I’d call it worth it just for the comfort and keeping the original look.

I’ve looked into those defogging services too, but from what I’ve read (and seen in my neighbor’s place), they’re really just delaying the inevitable if you’ve got a failed IGU. If you’re dealing with single-pane glass though, like you said, fresh putty and some patience go a long way.

It’s always tempting to chase a “miracle fix,” but sometimes old-school methods - like maintaining sash cords and making sure your storm windows are tight - make the biggest difference over time.

- I’m new to all this, but here’s what I’ve picked up:
- If it’s double-pane and foggy, resealing doesn’t really fix the problem long-term.
- Single-pane? Putty and a steady hand seem to work for most folks.
- I was surprised how much just tightening up my storm windows helped with drafts... didn’t expect that.
- Not sure defogging services are worth it if the seal’s already shot - seems like a band-aid.
- Curious if anyone’s actually had luck with those kits you see online?

I’ve actually had a different experience with defogging services. Tried one a few years back on a couple of my double-pane windows - honestly, they looked way better for about two years before the fog crept back in. Not perfect, but it bought me some time before shelling out for new glass. Those kits online? Mixed results. One worked okay, the other was a total mess. Sometimes just replacing the glass is less hassle in the long run, especially if you’re dealing with old seals that keep failing.

That lines up with what I've seen a lot - defogging can be a decent stopgap, but it rarely fixes the root issue. When you said,

“Sometimes just replacing the glass is less hassle in the long run, especially if you’re dealing with old seals that keep failing.”

- Defogging services: Short-term fix. If the seal’s shot, moisture usually finds its way back in.
- DIY kits: Mixed bag. Some are okay, but they can get messy and don’t always last.
- Full glass replacement: More upfront cost, but you get new seals and better energy efficiency. Less maintenance down the road.

One thing I always check is the window frame itself. If the frame’s in good shape and just the IGU (insulated glass unit) is fogged, swapping the glass is pretty straightforward. But if the frame’s warped or rotting, you might be looking at a full window replacement.

Curious - have you noticed if the fog comes back faster in certain rooms or exposures? Sometimes kitchens or bathrooms seem to have more issues just from the extra humidity.

Funny you mention certain rooms - my bathroom windows fogged up way faster than the others, especially in winter. I chalked it up to all the showers and steam, but I also noticed the south-facing windows had more problems over time, maybe from sun beating on the seals? I tried resealing once, but honestly, it was a pain and didn’t last. Swapping out just the IGU made a bigger difference, at least for me. If the frame’s solid, I’d say don’t bother with stopgaps - just replace the glass and be done with it.

That sounds a lot like what happened in my place. I kept fighting the fog on my kitchen window - tried resealing, even those moisture absorber packs, but it was just a losing battle. Eventually bit the bullet and replaced the IGU, and honestly, wish I'd done it sooner. The frame was still in good shape, so it wasn't as pricey or messy as I feared. You’re right, sometimes the “quick fix” ends up being more hassle than just getting it sorted for good. Hang in there - it’s worth it for clear windows again.