[moduspol]

Same here. I was truly surprised at how fast the CO2 goes up with our gas stove on. The only thing worse is when we use our unvented gas logs in the fireplace.

We're switching houses next month and I'm seriously considering putting in an ERV. It's just a little tricky to explain to friends and family because it kind of makes you sound like a crazy person. But CO2 is measurable! And there is clear science about bad effects when it gets high!

[simondotau]

PM2.5 is also measurable and is arguably the greater long-term concern to human health with respect to indoor combustion.

(Not to mention the physics of fireplaces makes them counter-productive. They are effectively air pumps which suck in the warmest air inside your home and send it up the chimney. And that air has to be replaced from somewhere, most likely bitter cold outdoor air, through the many concealed cracks and crevices in your home.)

[jonstewart]

Yeah, I want to put in an ERV, too, to have the sense of fresh air all year round.