Windows close for the season in a few weeks, and everything from cooking smoke, pet dander, and holiday-guest germs stays inside with you. I run a particulate sensor in my living room, and the PM2.5 reading triples the day the windows shut. The air purifier market splits into two camps: app-controlled bedroom units that look … Read more
I bought my first air quality monitor for a bad reason: a $130 portable heater had been making the bedroom smell faintly of plastic for two weeks before I thought to measure the room. The readout stopped being interesting the moment I understood what it was actually telling me — the bedroom CO2 was over … Read more
Our bedroom hygrometer read 28 percent all last winter, and I kept refilling a dumb humidifier that ran wide open until the tank was dry — 3 a.m., empty, humidistat never consulted. Then I did the math that made me replace it: a bedroom held at 40–45% instead of 30% feels several degrees warmer at … Read more