@jmartin52 Oh wow, I’ve heard of that phenomenon but haven’t seen it in person. It’s definitely rare, but you’re right – low-E glass can act like a mirror for the sun. Some types of low-E have a more reflective exterior layer than others. In Florida, many low-E windows have a slight tint or mirror effect to reject the heat.
Usually it’s not an issue because the sun’s angle changes throughout the day, but if two houses are at just the right orientation, reflections can focus on one spot. I read an article about this happening with a skyscraper nicknamed the “death ray” in Las Vegas that melted parts of a car – same principle, just bigger glass!
For residential homes, the mitigation is exactly what your neighbor did: install a screen or even plant a shrub in the line of reflection to break it up. My low-E windows have the screens on (I leave the bug screens on year-round), which likely cuts any glare. And none of my neighbors have complained of being zapped, thankfully.
So, definitely an interesting quirk to note. But like you said, the benefits of low-E far outweigh that small chance of an issue. If anything, it’s a fun story to tell about how effective your windows are 😅. Just maybe don’t accidentally fry your neighbor’s lawn gnomes with reflected rays!
Hi everyone, I’ve been following this thread and it convinced me to get moving on my window upgrades too. I want to echo something mentioned earlier about using a good installer. My cousin in Bradenton replaced his windows last year, but he went with a super cheap quote from a less-established contractor (trying to save a buck). The result? Not great.
The windows themselves were decent, but the installation was sloppy – some ended up slightly crooked and one had a small leak when it rained. He had to call them back multiple times to fix things, and it was a headache. He ended up contacting one of the well-known companies (one mentioned here actually) to redo a lot of the work, which cost him more in the end.
So, lesson learned: choose a reputable installer even if their quote is a bit higher. The big guys (like the ones @elizabethhill590 considered, e.g. Karoly or ProTech) have experienced crews and warranties. My cousin wished he’d paid the extra upfront rather than deal with the aftermath of a bad install.
It sounds like @elizabethhill590 made a good choice with a reputable company. I just wanted to put this out there for others reading: don’t let a too-good-to-be-true price tempt you if you’re not sure about the installer’s track record. Windows are only as good as their install!
@brianfox763 Absolutely! Thanks for bringing that up. It can’t be overstated that installation quality is huge. A top-of-the-line window will underperform if it’s not shimmed and sealed correctly. And conversely, a mid-range window can do great if installed by pros who know what they’re doing.
In our case, we vetted the companies carefully and ended up paying a bit more for a company with a stellar reputation. No regrets at all – everything was done right the first time. I’ve heard the horror stories too (water leaks, drafts, windows that don’t open smoothly) when people go with unlicensed or inexperienced installers.
So yes, for anyone reading, do your homework on the installers. The ones with lots of good reviews and years in business are usually safe bets. You might spend a little more, but you’ll save yourself a lot of trouble.
Great advice, @brianfox763. Glad this thread is covering all the angles!
I can attest to the difference new windows make. We replaced the original 1993 aluminum single-pane windows in our Largo home with double-pane vinyl Low-E windows last spring. The house is so much cooler now! Our summer electric bill dropped by about 25%. In July, we used 1,200 kWh vs 1,600 kWh same month last year. I was amazed. It’s like the whole house got an insulation upgrade. Best home improvement we’ve done, honestly.
Same here! My 2001-built house in Clearwater used to have condensation all over the aluminum window frames every morning because of the humidity and cool indoor air. It was annoying wiping up water. After installing new vinyl-framed windows with Low-E glass, that problem vanished. No more “sweating” windows. Everything stays dry unless it’s actually raining. The improved insulation really shows when you don’t have those moisture issues anymore.
I live right on the bay in St. Pete, and the salt air was brutal on my old windows. They were aluminum frames and had started corroding (the finish was pitted and the hardware rusted). I switched to vinyl impact windows two years ago and it’s been a night and day difference. The vinyl doesn’t corrode at all, and the stainless hardware still looks new. Plus, I got the energy efficiency boost as a bonus – the rooms facing the water (west) are much cooler now. For coastal folks, vinyl (or fiberglass) is definitely the way to go to avoid that salt damage.
I want to highlight how incredible Low-E glass is in practice. After getting Low-E windows, I can stand in front of my big living room window at 2 PM in August and not feel like I’m standing in front of an oven anymore. Before, even with double-pane clear glass, I’d feel the sun’s heat pouring through. Now, I just feel brightness but little heat. It’s almost uncanny. My AC still runs, of course, but I’d say the house stays about 5 degrees cooler on its own than it used to on hot days. Low-E is a game changer for Florida sun.
If you can’t afford to do all your windows at once, consider doing the most sun-exposed ones first. That’s what I did. I have a 2007 home in Wesley Chapel. I replaced only the south and west side windows (8 windows total) last year, and left the north/east side for later. Even with half the house done, I noticed a difference. The rooms with new windows cool down much faster and don’t get as stuffy. My electric bill went down a bit – not huge, maybe 10% – but I expect once I do the other half of the house it’ll be more. So, partial replacement is a viable approach if you prioritize. Just thought I’d share that for anyone who might be on a tight budget.
One thing I didn’t anticipate after getting new windows was how much cleaner my house would be. Sounds weird, but apparently my old windows had tiny air leaks that were letting in dust and pollen. I used to find fine dust on the windowsills all the time and even had more allergy issues indoors. Since the upgrade (went from old single-pane to modern tight-sealing double-pane), I have way less dust accumulation near the windows. My allergies have improved too – probably because less pollen is sneaking in. It’s like the house is not only more efficient but also “tighter” against outside elements.
I can relate on unexpected benefits – for me it was saving my furniture from sun damage. Our old windows had no UV protection, and the sun ruined the color of a couch and some wood flooring by the big windows. After getting Low-E glass (which blocks most UV), I’ve noticed zero fading issues. The new area rug by the window still looks brand new after two summers, whereas the old one faded within one summer. So, beyond energy savings, the UV blocking of modern windows is a huge plus for preserving your interior decor.