I’ve swapped out just the IGU on a couple of my vinyl windows when the seals failed—definitely cheaper than a full frame replacement, especially if your sash is still in good shape. Resealing didn’t do much for me, though. The fog always crept back after a season or two. Did you notice any difference in energy bills after the seals went bad? I feel like my heating costs jumped more than I expected.
Yeah, swapping just the IGU is usually the way to go if the sash is still solid—no sense ripping out the whole window if you don’t have to. I’ve seen resealing work for a bit, but like you said, that fog tends to creep back. As for energy bills, you’re not imagining it. Once that seal fails, you’re basically losing the insulation value, so the drafts and heat loss add up. You’re on the right track just replacing the glass.
I’m with you on the IGU swap—resealing just seems like a temporary band-aid, at least in my limited experience. I tried one of those “defogging” kits on a bathroom window and it looked okay for a few months, but by the next season, the condensation was back and honestly worse. I get why folks try it since it’s cheaper up front, but factoring in energy loss and the hassle of doing it again, I don’t see the value.
One thing I learned digging into this: once the argon (or whatever gas) leaks out of the IGU, you’re basically left with a single pane for insulation. I saw my heating bill creep up last winter and didn’t put two and two together until I read up on how much those seals matter. If your sash is still square and not rotted, replacing just the glass is way less invasive and keeps the original look, which was important to us since our house has weird-sized windows.
I guess if the sash is shot or you want to upgrade to something more efficient, that’s when a full replacement makes sense. But otherwise? I’d skip the reseal route.
Yeah, I hear you. I tried the “reseal and hope” approach on a couple of my old casements a few years back. It was cheaper, sure, but those foggy streaks came back way faster than I’d hoped. Honestly, felt like tossing money into the wind. Once that seal goes, you’re right—the insulation’s pretty much toast. If the frames are still solid, swapping just the IGU is about as painless as it gets for old houses. Full window replacements are such a headache unless you’re already dealing with rot or drafts everywhere. Resealing just doesn’t seem worth the hassle in the long run.
I get where you’re coming from. I tried resealing on two north-facing windows in my 70s ranch, thinking I’d save a buck. Didn’t even last a year before the fog crept back in. The energy bills didn’t budge either—guess that’s what happens when the argon’s gone for good. Swapping the IGU was way less drama than I expected, and the difference in comfort was immediate. Full replacement’s overkill unless the frames are truly shot, in my experience.
Yeah, resealing was a bust for me too—felt like putting a Band-Aid on a busted pipe. I swapped just the glass units last fall after getting tired of wiping fog every morning. Noticed the room’s way less drafty now, but I did have to hunt around for a company that’d do IGU only instead of pushing full window replacements. Curious if anyone’s tried those DIY defogging kits? Seemed too good to be true when I looked into it...
Tried one of those DIY kits a couple years back—honestly, it just made my wallet lighter and the fog came back anyway. I think once the seal's shot, it's tough to get a real fix without swapping out the IGU. Full window replacement always seemed overkill (and pricey) to me, unless the frames are rotted or warped. Glad to hear just swapping the glass made a difference for you.
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Couldn’t agree more. My frames were still solid, so I just swapped out the glass units last fall.Full window replacement always seemed overkill (and pricey) to me, unless the frames are rotted or warped.
- Cost was way less than full replacement—still stung a bit, but at least my coffee doesn’t fog up the living room now.
- Tried that “drill-a-hole” reseal trick once... yeah, just made my windows look like swiss cheese and the fog laughed at me.
- If your seals are toast, glass swap seems like the sweet spot. Only exception: if you secretly want new windows anyway for an excuse to upgrade.
Tried that “drill-a-hole” reseal trick once... yeah, just made my windows look like swiss cheese and the fog laughed at me.
Had to laugh at that—same here. Gave the drill method a shot on a basement window, and all I got was condensation plus a weird whistling noise when it was windy. Swapping just the glass units made way more sense for me too. Full replacement is really only worth it if your frames are falling apart or you’re itching for a style upgrade. Otherwise, glass swap is the sweet spot—less mess, less cash, and you keep the original look.
Swapping just the glass units made way more sense for me too. Full replacement is really only worth it if your frames are falling apart or you’re itching for a style upgrade.
Totally agree—unless you’ve got rotten frames or some serious draft issues, no need to go all-in. I swapped out just the glass in our sunroom last winter, and honestly, you can’t even tell anything was done except the fog’s gone. Anyone actually had luck with those “defogging” companies? I’m skeptical, but maybe I’m missing something.