Getting the most LEED credits out of window upgrades – worth the hassle?

- Swapping to higher VT glass is a move I see a lot lately - folks underestimate how much that low-E tint dims things.
- Solar tubes can help, but yeah, if you’re not up for cutting into the roof, better glass is less hassle.
- LEED points are nice, but sometimes the install cost or look isn’t worth it for every client.
- Curious - did anyone notice interior fading or heat gain after switching to higher VT? Sometimes it’s a tradeoff.

I get the appeal of more daylight, but after swapping to higher VT glass in my kitchen, I actually regretted it a bit. Sure, things looked brighter at first, but I started noticing my wood floors near the windows faded faster than before - like, noticeably within a year. The extra heat was also real during summer afternoons, even with the AC. I guess if you’re not in a super sunny spot it’s less of an issue, but for me, the tradeoff wasn’t worth it. Sometimes that tint does more than people think…

Sometimes that tint does more than people think…

Yeah, you nailed it - high VT glass really can be a double-edged sword. Folks get all excited about daylighting for LEED points, but it’s easy to forget UV and heat gain are part of the package too. I’ve seen a few clients swap out their windows for “greener” ones, then scramble to add window films or even shades after the summer hits. That fading on the floors is real - UV coatings matter just as much as visible light, especially with hardwood. Sometimes a little tint saves you a lot of headaches (and refinishing bills) down the line.

I get where you’re coming from about the fading - my hardwood floors have seen better days thanks to the sun. But honestly, I don’t think a little tint is always the answer.

“Sometimes a little tint saves you a lot of headaches (and refinishing bills) down the line.”

- Totally hear you on the cave vibe - went too dark once and my living room felt like a bat cave for a year.
- Ended up swapping to low-E glass with just enough UV block to keep my floors from turning zebra-striped.
- Cellular shades are a lifesaver, especially in the summer. Just wish my cat didn’t think they’re for climbing...
- LEED credits are nice, but honestly, comfort and not tripping over furniture in the dark wins for me.

I totally get the “bat cave” problem - been there with a client who wanted max efficiency and ended up needing a flashlight to find their couch. Low-E glass is a solid middle ground, though. I’ve seen folks go all-in for LEED points, but honestly, if you’re squinting just to read your phone, it’s not worth it. The comfort factor really does outweigh the bragging rights sometimes. And yeah, cats vs. cellular shades... let’s just say mine “customized” the bottom row.

- Just finished a round of window upgrades last winter. Went for triple-pane with Low-E coating, hoping to snag some LEED points and cut down on drafts.
- What I didn’t expect: the living room got noticeably darker, especially on cloudy days. I measured about a 20% drop in light levels with my cheap lux meter - enough to make the space feel a bit gloomy unless I keep the blinds all the way up.
- Energy bills are down, but not dramatically. Maybe 10-12% in heating so far.
- The install was a pain - lots of dust, and the trim around the windows needed patching after.
- Was it worth it? For comfort (less draft, quieter), yes. For LEED points specifically, I’m not so sure. The paperwork was a hassle and I’m not convinced the resale value will change much in my neighborhood.
- Also: our dog “tested” the new cellular shades within a week... let’s just say they’re not as pet-proof as I’d hoped.
- If I did it over, I’d probably balance efficiency with natural light more carefully. The darkest rooms bug me more than I thought they would.

Did you look into any of the higher-visibility Low-E coatings before picking yours? I’ve read some let in more light but aren’t as efficient. Wondering if that tradeoff would’ve helped with the gloominess, or if it’s just the nature of triple-pane glass.

That’s a solid question. I’ve run into the same debate with clients - balancing visible light transmittance (VLT) against thermal efficiency isn’t trivial. Some of those higher-visibility Low-E coatings (like Cardinal 366 vs. 340, for example) do let in more daylight, but you’re right, they usually sacrifice a bit on the U-factor or solar heat gain coefficient. In darker climates or north-facing rooms, that extra light can make a noticeable difference in the “feel” of the space, even if the numbers on paper don’t look as strong.

Triple-pane definitely tends to be a bit gloomier, just due to the sheer amount of glass layers and coatings. I’ve seen folks try to offset that with lighter wall colors or bigger windows, but it’s never quite the same as double-pane with a high-VLT coating. Did you happen to look at any samples in person, or just go off manufacturer specs? Sometimes what looks good on paper doesn’t match how it feels day-to-day once installed... Curious if anyone’s actually regretted going for max efficiency over comfort.

Sometimes what looks good on paper doesn’t match how it feels day-to-day once installed...

That hits home. I’ve installed both triple and double pane with different coatings, and honestly, the difference in “feel” is real. Some clients love the efficiency stats, but a few have mentioned their living rooms just feel darker, even with lighter paint. Still, if you’re chasing LEED credits, it’s tough to beat triple-pane for points. It’s a balancing act - comfort vs. numbers - but I always tell folks you can’t put a price on how a space feels to live in.