That's what I've discovered over the past year! I live in NYC and my CO2 levels are fine in both the winter and on hot summer days, without even trying.
But when it's 65-75°F outside in the spring/fall... CO2 builds up in my apartment like crazy. I keep the windows open and my bathroom fan on to try to suck fresh air in... but even so can't manage to really get it below 650, and with just a window cracked it sticks around 850.
But when it's 65-75°F outside in the spring/fall... CO2 builds up in my apartment like crazy. I keep the windows open and my bathroom fan on to try to suck fresh air in... but even so can't manage to really get it below 650, and with just a window cracked it sticks around 850.
It's really frustrating.