Things I wish I’d known before swapping out my old windows

Curious if anyone’s tried one of those blower door tests before doing upgrades. I keep hearing about them but haven’t pulled the trigger yet.

I actually did a blower door test before starting any big projects, and I was shocked at how much air was leaking through spots I never would’ve checked—like behind electrical outlets and along the rim joist in the basement. If you’re on the fence, I’d say it’s worth it just for the “aha” factor. It pointed me right to the worst offenders so I didn’t waste time or money guessing. And yeah, expanding foam is tricky...I went overboard behind my tub and had to chisel some out after it dried. Live and learn, right?

That “aha” moment you mentioned is spot on.

“I was shocked at how much air was leaking through spots I never would’ve checked—like behind electrical outlets and along the rim joist in the basement.”

Totally agree it’s worth doing before you start spending big money. It’s not exactly cheap, but compared to replacing windows or doors blindly, it’s a bargain for the info you get. And yeah, expanding foam is a beast—I once filled a gap under my stairs and ended up with this weird lumpy mess that took forever to trim down. Definitely a learning curve.

If you’re on the fence, I’d lean toward doing it. You’ll probably end up saving yourself some headaches (and cash) down the road.

- That’s wild—I always assumed windows were the big problem too.
- Never thought about attic hatches or crawlspace gaps until I started reading up on air sealing.
- Blower door tests sound super useful, but I’m a little intimidated by the idea of finding a bunch of hidden leaks.
- Did you have to move insulation or drywall to get to those spots? Or was it mostly surface-level fixes?
- Expanding foam stories crack me up... I’d probably end up with a foam sculpture under my stairs.

- I was 100% convinced windows were the main culprit for drafts until I got a cheap thermal camera. Turns out, the attic hatch was basically a wind tunnel.
- Blower door test was eye-opening—kind of stressful but also cool to see the numbers drop as I fixed things. Didn’t have to rip out drywall, but I did have to peel back some insulation in the attic and crawl around with a headlamp. Not glamorous work…
- Expanding foam is a love-hate thing for me. It’s great for weird gaps, but yeah, it expands way more than you think. My first try ended up looking like a failed art project behind the water heater.
- If you’re detail-oriented, tracking down leaks can actually be fun (in a nerdy way). Just be ready for some awkward crawling and maybe a few cobwebs.
- Honestly, air sealing made more difference than swapping out my old double-panes. Windows matter, but those hidden gaps add up fast.

Totally relate to the attic hatch surprise. I thought I was being clever sealing around my old windows, but then I found this ridiculous draft coming from behind the baseboards in the living room. Turns out, the rim joist was basically a freeway for cold air. Thermal camera was a game changer—makes you feel like a home detective, minus the cool hat.

Blower door test felt like an episode of Mythbusters at my place... numbers flying everywhere, me crawling around with a caulk gun and a face full of insulation. Not my most dignified moment.

And expanding foam... yeah, that stuff is both magical and terrifying. I’ve had it ooze out in places I didn’t even know existed. Next time, I’m wearing gloves and maybe a rain poncho.

Honestly, after all the crawling and sneezing, air sealing made a way bigger dent in comfort (and my heating bill) than when I swapped out my windows. If I could do it again, I'd definitely chase down all those sneaky leaks first before going window shopping.

Interesting—did you actually notice much difference after the new windows, or was it mostly just quieter? I keep wondering if the window swap is worth it for an old drafty house like mine, or if it’s more about aesthetics and resale value. I get the whole air sealing thing makes a big impact, but isn’t there a point where old windows are just too far gone? Sometimes I feel like I’m just delaying the inevitable by patching up everything else.

I get where you’re coming from—sometimes it feels like old windows are just a money pit, especially in a drafty house. But honestly, in my experience, swapping them out was about more than just quiet or looks. I live in a 1920s place with original wood sashes, and after years of weatherstripping and caulking, it was still freezing by the windows every winter.

Once I put in new ones (mid-range double pane, nothing too fancy), the drafts actually stopped. The difference wasn’t just noise; my heating bill dropped noticeably. I do think there’s a point where patching is just putting off the inevitable, especially if the frames are rotting or warped. That said, if your originals are still solid and you like the character, sometimes restoring them with proper storm windows can be surprisingly effective—and cheaper upfront.

For me, it really came down to comfort and energy use more than resale or curb appeal. There’s always some regret when you lose that old charm, but not shivering at night kind of won out for me.

I totally get why you made the switch—being cold in your own house is just miserable. But I do wonder about the long-term energy savings with new windows versus restoring old ones and adding storms. Have you noticed if your bills stayed lower over a few years, or was it just that first winter? I’ve read in some places that the payback period for new windows can be way longer than people expect, sometimes even decades, depending on how much you spend upfront.

I went the restoration route in my 1930s bungalow. It took a bit more elbow grease and patience (and yeah, some weekends lost to scraping and reglazing), but with good storm windows, the drafts are pretty much gone. My utility bills dropped, but maybe not as dramatically as with a full replacement. Still, I like that I kept the original look.

Curious—did you notice any condensation issues with the new windows? I’ve heard that can happen if the house gets too airtight. Just something I’ve been wondering about as I weigh my options for the upstairs windows...