I am wondering if anyone knows why when I turn my recently installed high-efficiency air conditioner on, CO2 levels rocket up in my house? (In just 4 hours they go from around 500ppm to 1200ppm, and that's across all three floors of two-storey house plus the basement).
This effect doesn't happen when we have the furnace running (the house is usually at around 700ppm CO2 in Winter. What could be causing CO2 to climb so high, so quickly, across a whole 3-storey home with only 3 people in it, and only with the AC? Any ideas or suggestions for what to do to fix this welcome!
I have tried cracking a basement window open a couple of inches, and turning the fan on too. With the furnace/ winter cycle this gets our CO2 down to around 500-700 ppm AOK. But today with the AC/summer cycle turned on, it seems to have only a negligible effect, our CO2 is still stubbornly at around 1100. We had the same problem last summer. I have tried measuring CO2 levels all over the house but can not find a "leak" anywhere. Not sure what the cause might be. Please help as I know this is bad for my family's health. Many thanks.