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Ventilation in new builds—are we overlooking something important?

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(@lindachessplayer)
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Yeah, I hear you on that. My uncle’s place is a newer build—super tight, all the fancy insulation and seals. He had to get a dehumidifier after his windows started sweating every morning in winter. No mold yet, but it’s only been a year. I get why they push for airtight, but honestly, sometimes it feels like we’re trading one problem for another. Cracking a window just hits different than relying on a fan or HRV system... at least where I’m at.


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vlogger31
Posts: 16
(@vlogger31)
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I get what you mean—my place is only a couple years old and I swear, it’s like living in a Ziploc bag sometimes. The builder hyped up the “energy efficiency” but didn’t mention I’d be wiping down windows every morning in January. I tried the HRV thing, but honestly, it just feels weird not being able to just crack a window for a minute. Sometimes I wonder if we’re all just trading drafts for damp socks...


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(@painter44)
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- Totally get the “Ziploc bag” vibe—my buddy’s new place is the same.
- Energy efficient, sure, but now he’s got a science experiment growing on his window sills every winter.
- HRV is supposed to help, but it’s not the same as just letting in some fresh air for five minutes.
- Sometimes feels like we’re trading old-school drafts for a constant battle with condensation... not sure which is worse.
- I kinda miss the days when you could just open a window without feeling guilty about your heating bill.


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nala_seeker
Posts: 15
(@nala_seeker)
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I get where you’re coming from about the “sealed box” feeling, but I think the HRV/ERV systems are a bit underrated. The thing is, if they’re sized and balanced right, they should be able to handle most of the moisture issues—at least in theory. A lot of the time, though, I see them installed with barely any commissioning or adjustment. People just set them and forget them, or leave them on the lowest setting to save power, and then wonder why there’s still condensation.

I grew up in an old house where you could literally feel a breeze through the outlets in winter, so yeah, it was “ventilated”... but we also had ice dams and crazy heating bills. Now with these tight envelopes, you really do have to rely on mechanical systems. It’s not perfect, but I’d rather deal with tweaking an HRV than paying to heat the outdoors all winter.

That said, I do miss just cracking a window sometimes without feeling like I’m throwing money away. Maybe there’s a middle ground—like running the HRV higher during showers or when cooking? Still figuring it out myself...


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surfing277
Posts: 14
(@surfing277)
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People just set them and forget them, or leave them on the lowest setting to save power, and then wonder why there’s still condensation.

That’s exactly what I see on inspections—folks rarely adjust their HRV after move-in. I’ve walked into brand new homes with condensation on the windows and bathroom fans barely pulling any air. Do you ever notice how much difference a simple commissioning makes? In one case, just rebalancing the system and upping the runtime during winter solved most of the homeowner’s complaints. Still, it’s tough convincing people that “set it and forget it” doesn’t really work for these systems... Or maybe I’m just old school and miss cracking a window too.


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