Yup. Now that I'm measuring how much CO2 I have indoors and can watch what happens when I open a window and it equilibrates, it's really hard to resist 2021+ pl

Yup. Now that I'm measuring how much CO2 I have indoors and can watch what happens when I open a window and it equilibrates, it's really hard to resist 2021+ plans to retool the HVAC to put in a fresh air ventilator. There were also a few days this summer where it was 50°F and low-humidity outside, but 78°F inside, my preferred temperature was closer to 72°F, and I wished I had some better way than "open a window and stick in a Lasko box fan" to cycle in cool outdoor air.