Anyone actually notice a difference with krypton-filled windows?

I get where you’re coming from. I swapped out a few windows for triple-pane with argon a couple years back (couldn’t justify the krypton price), and honestly, the biggest difference was just not feeling those cold drafts anymore. My heating bill dropped a bit, but not enough to make me do a double take. From what I read, krypton’s only a big jump over argon if you’ve got super narrow panes - otherwise, it’s more of a marginal gain. At least the living room feels less like an icebox now, but I’m not sure the extra cost would’ve been worth it for me either.

From what I read, krypton’s only a big jump over argon if you’ve got super narrow panes - otherwise, it’s more of a marginal gain.

Yeah, I’ve heard the same about krypton - unless your panes are really thin, it’s not some night-and-day difference over argon. I get what you mean about the drafts being gone making the biggest impact. For me, that “icebox” feeling disappearing was worth way more than the tiny change on my utility bill. Sometimes the comfort upgrade just matters more than the numbers, you know?

I get where you're coming from - comfort is huge, and sometimes the numbers don’t tell the whole story. But I’ve actually noticed a difference with krypton in my place, even though my panes aren’t super narrow. We’re in a pretty harsh climate, and after swapping out old argon units for krypton, the rooms closest to the windows stayed noticeably warmer during cold snaps. It wasn’t dramatic on every bill, but over a couple winters it added up more than I expected. Maybe it depends a bit on house orientation or how exposed your windows are? Not saying it’s always worth the extra cost, but sometimes those “marginal gains” do add up, especially if you’re already planning to upgrade.

Noticing a theme here - folks expect these “premium” gases to be some magic bullet, but it’s rarely that dramatic in real-world use. I’ve handled installs where customers swapped out old leaky windows for triple-panes with krypton, and honestly, the biggest difference always seems to be just having modern, tight windows.

Krypton’s supposed to work better in really narrow air spaces (think triple-panes), but unless you’re dealing with super cold exposure or a ton of glass, the extra insulation isn’t always obvious. I usually tell people: 1) draft-proofing is step one, 2) proper install matters way more than the gas choice, and 3) don’t expect your bill to get cut in half just from the fill.

Out here, I’ve had a few folks say their rooms felt less “chilly by the window” after going with krypton, but they also upgraded frames and seals at the same time. Hard to separate what’s doing what. Personally, I’d go for argon unless you’ve got a very specific reason - or if you’re just curious and want to try it out. Sometimes peace of mind is worth a few bucks, even if the numbers don’t totally back it up.

“the biggest difference always seems to be just having modern, tight windows.”

That’s been my experience, too. I’ve swapped out a bunch of old double-panes for newer triple-panes with both argon and krypton, and honestly, it’s tough to pin down what’s actually making the room feel warmer. Is it the gas, or just the fact that you’re not living with 30-year-old leaky frames anymore?

I get why folks are curious about krypton, especially since it’s marketed as the “upgrade” for narrow gaps. But unless you’re in a spot where every last bit of insulation matters - like a home with a wall of north-facing glass in Minnesota - I’m not sure the difference is worth the upcharge. Have any of you actually measured surface temps before and after? I’ve tried with an IR gun, but results were all over the place.

One thing I do wonder: does anyone regret not going for krypton after a few winters? Or is it more about peace of mind than real-world comfort?

I actually kinda disagree about the “not worth it unless you’re in Minnesota” thing. I’m in the mid-Atlantic, so winters aren’t brutal, but our living room has a huge north-facing window. We did krypton for just that one and left the rest as argon. I swear that room feels less drafty now, even if the temp difference is small. Maybe it’s placebo, or maybe it’s just that the old window was junk, but I don’t regret spending a little extra on that one spot. For the rest, though, probably overkill.

We swapped out the old bay window in our dining area for a krypton-filled unit last fall. I can’t say the temperature is dramatically different, but the drafts are almost gone - used to feel a cold breeze anytime you sat near it. The rest of the house is just standard argon, and honestly, I don’t notice much difference there. Maybe it’s just that big windows facing north make a bigger impact? Either way, for that one spot, the extra cost felt justified. Wouldn’t bother with every window, though - gets pricey fast.

Had a similar experience, actually. We did a krypton-filled slider in our living room - mainly because that window is massive and faces west, so it used to get real drafty in the winter. Like you, I can’t say the room feels much warmer in terms of raw temperature, but the cold air currents are way less noticeable. Before, you’d sit on the couch and feel that chill creeping in around your ankles. Now, it’s pretty much gone.

Rest of our windows are just double-pane with argon, and honestly, the difference isn’t huge except for that big window. I think it’s partly that older frames and bad seals were letting in most of the cold before, so just fixing that helped a ton. Krypton’s nice for big problem spots, but yeah, it adds up quick if you try to do the whole house.

If I had to do it over, I’d still upgrade the main window but not bother with the smaller ones. Sometimes fixing the worst offender is enough... no need to go overboard.

That lines up with what I’ve seen. I put krypton in our big bay window because it was just a cold magnet, but honestly, the smaller windows got the argon treatment and you really can’t tell much difference unless you’re right next to the glass. The biggest improvement came from finally fixing those ancient, leaky frames - funny how much air sneaks in through bad seals. For me, the cost of krypton everywhere just didn’t make sense. If you’ve got one “problem child” window, that’s where it’s worth splurging. Otherwise, argon and good install does most of the heavy lifting.

That’s pretty much what I see when I’m out on jobs. People get sold on the idea that krypton will make every window feel like a wall, but unless you’re dealing with a really big or north-facing window, argon does the trick for most folks. Did you notice any difference in condensation with the krypton? Sometimes I’ve seen it help a bit there, but honestly, like you said, sealing up old frames makes a bigger impact than the gas fill in most cases. Curious if anyone’s had a different experience.

I gotta say, I actually did notice a difference with krypton, but only in the dead of winter. My living room faces north and those windows used to sweat like crazy. With the krypton, the condensation dropped off a ton. But yeah, sealing up the old frames made a bigger difference than anything else. The price tag on krypton still stings a bit though...

Yeah, I’ve noticed something similar with my place. North-facing windows always seem to be the worst for condensation, especially when it really dips below freezing. The krypton fill definitely helped, but honestly, air sealing and adding some decent weatherstripping around the frames made a bigger dent in comfort and energy bills for me. The cost of krypton is tough to swallow - I kept wondering if argon would’ve been “good enough.” Still, less sweating on the glass is a win in my book.

- Honestly, I went with argon because the price difference just seemed too much for krypton.
- Haven’t really seen a massive change in condensation either way - still get a bit on cold mornings.
- Did notice better results after I fixed up some gaps around the window frames, like you said.
- Not sure if it’s worth spending extra for krypton unless your windows are super old or drafty...
- Maybe it’s just my house, but air sealing felt like the real game-changer.

Funny, I had the same debate when we replaced our windows last winter. Ended up sticking with argon too - couldn’t justify the extra cost for krypton, especially since our house isn’t that old. Sealing up the trim made a way bigger difference for drafts than any gas fill did. Unless you’re in some extreme weather or have ancient windows, I honestly think good air sealing and decent double panes get you most of the way there.

When we did our big reno about six years back, I went down the same rabbit hole - read up on all the gas fills, R-values, you name it. Ended up with argon in double panes, mostly because the jump to krypton just didn't pencil out for our 1980s place. What really surprised me was how much difference just re-caulking and foaming around the frames made. Honestly, my toes were always cold before that, even with the old windows. Once we sealed everything up tight? Way more comfortable, and the heating bills dropped noticeably. Maybe if I lived in Alaska or something I'd consider krypton, but for most of us, good sealing does more heavy lifting than the gas between panes.

I get where you’re coming from - sealing up drafts makes a huge difference, no question. But I’ve actually seen krypton-filled panes make a noticeable impact in really cold spots, even outside Alaska. It’s not just hype if you’re dealing with brutal winters and smaller air gaps. For milder climates though, yeah, sealing usually gives you more bang for your buck.

For milder climates though, yeah, sealing usually gives you more bang for your buck.

Totally agree with this. I live in a spot where winter means a chilly breeze and maybe a sweater, so I went nuts with weatherstripping and caulk instead of fancy gases. Honestly, my utility bill dropped more from sealing up the weird cracks behind my baseboards than anything else. My neighbor did the krypton thing - he swears by it, but he also keeps his house like a meat locker year-round. Maybe it’s one of those “depends how cold you like it” deals?

my utility bill dropped more from sealing up the weird cracks behind my baseboards than anything else.

Yeah, same here. I started with the obvious stuff - windows and doors - but honestly, it was the little gaps around outlets and pipes that made the biggest difference. I did look into those fancy gas-filled windows, but for my 70s ranch, it just seemed like overkill. Maybe if I lived somewhere with real winters, I'd notice more? For now, a tube of caulk and some foam gaskets go a long way.

That lines up with my experience too. I got way more mileage out of sealing up all the oddball gaps than anything else - especially in an older house like mine. Fancy windows sound nice, but unless you’re in a super cold spot, the return just isn’t there. Sometimes the low-tech fixes really do pay off.