That time I found out my house was basically a sealed plastic bag
I was reading through some HVAC forums (my field, I know) and stumbled on a stat that said modern homes exchange indoor air only 0.5 times per hour compared to 1.5 times for older ones. That got me thinking about my own 1990s house, so I grabbed a carbon monoxide detector and set it in my basement workshop for a weekend while I was running a gas heater. After 8 hours, the levels hit 45 ppm, which is way higher than the safe 9 ppm limit. Anyone else check their air quality after sealing up drafts and windows?