"Recently setup a pair of Apollo AIR-1s in my house. At first I was thinking they must have been wrong in terms of CO2 levels in my house as they regularly were showing them above 1500ppm. However, after we had a recent few days of nicer weather where we could open up the windows it was immediately apparent they weren't actually wrong. The levels really were that high. I saw similar behaviors for VOCs. If something caused a spike, it'd take days to have it come down, but opening windows for 15 minutes would drop it like a stone. This confused me as we have a fresh air intake on our HVAC for exactly this kind of thing. Turns out, while the controller for the intake was working, the motor that controlled the damper had, at some time ago seized. So while it would still try to open/close, it never did. Getting that replaced meant that our CO2 now hovers around 800-1200 ppm. Still not as good as I'd like, but no longer climbing to 1500+."

"After watching several Youtube reviews, I purchased the MSR-2. It arrived in a timely manner.As a brand new Home Assistant user, I was able to install and begin using the MSR-2 right away.When I did have some questions, Apollo support responded quickly and with a lot of details making it easy to use their info.I will buy this and other Apollo products again."

"Amazing product out of the box. I do live in a townhome, so it did require a bit of tweaking. The engineering mode made it easy to view the gate energy, and change the number of gates the sensor was using based on the room size. Once this was set, the sensor worked flawlessly to only detect movement within the room, and keep the lights on even with the slightest of movements. Will be purchasing more in the future!"

" I got the AIR-1 with CO2 sensor. I wanted to figure out why sleep quality was sometimes poor, and my suspicion was high CO2 levels in the room in question. Surprisingly, it showed that CO2 was fine, but allergens and other PMs were high. This has allowed me to focus my attention on air filtering. Being able to know where to direct my efforts has been a great bit of peace of mind!"

"I recently replaced my Airthings view plus by an Air-1. For a while I owned both and could compare them. Both devices are quality devices with good sensors and sensible measurements:- The Airhings is a black box device with a great app. But I didn’t like the automatic calibration of the CO2 sensor that maps the latest measurement of the last week on to 420.ppm. Also the sensors where only updating once per ca 6 to 7 minutes.- The air-1 has a clear manual CO2 calibration procedure and responds faster to changes as the sensors update more frequently. For interaction it fully depends on a smart home ecosystem like home assistant. The installation using ESPHome in HA works great.I really recommend this device for those owning home assistant."

"I have nothing but high praise for Apollo Automation's multi-sensors. I've tried Aqara, Sonoff, rolling my own on ESP32 boards, and 4 or 5 other "brands" from Ali Express. These sensors and their supporting plugs as a package are far and away the best ever. Attention to detail for the the win! My home feels and is smarter with Apollo Automation."