I have two indoor units. One, in my bedroom area (20x20 plus hallway, bath, etc). The other In a downstairs open area 2000+ sq ft, high ceilings. The readings are usually 500-650. But twice I have had times where the readings jump to 1100-1400 for days at a time. One of these times is now, the other just before summer. (after a week or so it went right back to normal) I am the only person in the home.
No appliances running, whether the hvac is running makes no difference. There have been times of normal readings with it running or not. Right now, the weather is cloudy and raining so the hvac hasn’t been running. A couple days ago I saw the readings shoot up from 550 when I went to bed to 1100 when I got up. The other monitor was high as well. Yesterday afternoon, I opened all the windows, doors for over an hour and let the wind bring in fresh air. I put the monitors outside and recalibrated them. I had the “use default configuration” option on but switched it to “off”. This morning when I got up, both monitors were at 1400. That seems crazy as I’m the only one in the home right now and for months in between the last high readings it’s been in the 500-600 range 24/7.
Any ideas or advice would be appreciated.