One thing I've come across more than once is the use of oversized HVAC units in newer homes—builders sometimes think bigger is better, but that can cause short cycling and humidity issues. Have you checked if the HVAC systems in these problematic houses are properly sized for the actual square footage and layout? Could be another overlooked factor causing moisture buildup...
I've seen this exact issue before—oversized HVAC units causing humidity headaches. A quick way to check sizing yourself is to look up the recommended BTU per square foot for your climate zone (there are charts online). Then, compare that to your unit's rating. If it's way off, you might have found your culprit. Had a neighbor who downsized their AC after constant mold issues, and it solved the problem completely...plus saved them money on energy bills. Win-win, right?
"Had a neighbor who downsized their AC after constant mold issues, and it solved the problem completely...plus saved them money on energy bills."
This makes total sense. When we moved into our place, the previous owner had installed this massive AC unit—probably thinking bigger was better. But we noticed right away the air felt clammy, even though it was cool. After some digging around online, turns out oversized units cycle on and off too quickly, never properly dehumidifying the air. Downsizing seemed counterintuitive at first, but it really did help with comfort and cut our electric bill noticeably.
Yeah, I was pretty skeptical about downsizing at first too. When we bought our new build, the builder had installed a huge AC unit—probably figured bigger meant better cooling or something. But honestly, the air always felt weirdly damp and uncomfortable, even though the thermostat said it was cool enough. I thought maybe it was just me being picky, but then we started noticing mold spots popping up in the bathroom and closets. Not exactly what you expect from a brand-new house.
After chatting with a friend who works in HVAC, he explained that oversized units cool the air too quickly and shut off before they can properly pull moisture out. Basically, the AC never runs long enough to actually dehumidify the place. I was still hesitant to spend money replacing something that was technically working, but eventually we bit the bullet and downsized.
Honestly, best decision we made. The air feels way more comfortable now—no more clammy feeling—and the mold hasn't come back. Plus, our energy bill dropped noticeably, which was a nice bonus. I guess sometimes bigger really isn't better, especially when it comes to AC units.
Still, it makes me wonder why builders don't pay more attention to this stuff from the start. Seems like proper ventilation and humidity control should be basic considerations, especially in newer homes. Maybe they're just cutting corners or assuming buyers won't notice? Either way, it's definitely something worth looking into if you're having similar issues.
Interesting points, but maybe it's not just about AC sizing? A few thoughts:
- Could be builders aren't necessarily cutting corners, but just following outdated standards or generic guidelines. HVAC sizing charts haven't always kept pace with modern insulation and airtightness improvements.
- Also, focusing solely on AC might overlook other ventilation solutions. Have you considered passive ventilation or even green roofing? Plants on roofs can naturally regulate humidity and temperature—plus they're eco-friendly.
- I get the appeal of downsizing your AC, but maybe pairing it with better ventilation or humidity control systems could've solved the issue without replacing the whole unit?
Just thinking out loud here... seems like there's more than one way to tackle humidity and mold issues in new builds.
