8:30p 230ppm over
6:30a 290ppm over.
2 adults + 1 toddler in the house during that time. Will check again later today to try and get a 24 hour look. Also noted that the RH dropped from 48% at 6:30p to 43% at 8:30p. Was back at 48% this morning, but the dehumidification cycle had not run. Usually we hover around 47-48% and require dehum in the early morning hours to stay <50%.
Looking at Carnak's and http://www.illinoisashrae.org calculations, 10080/(Indoor CO2-Outdoor [my meter zero'd to ambient])=CFM per person
My conditioned space is 53,600 cu ft. I'm assuming it will take a while for things to equalize with only 1 or 2 people occupying the house?
My average inside with ERV running 30% was 170. So about 60CFM per person? 120CFM total, and 63 CFM should be from the ERV (210cfm * 30%). That would leave 60CFM of leakage, or .065 ACH naturally? Is that possible for a new house, closed cell foam insulation, warm day, low wind???
Without the ERV running that should be about 30 CFM per person and put me at 310 or so over ambient? Just a little shy of where I measured it after 12 hours. This makes me think my infiltration is a bit higher, and the ERV is running a little less than published spec.