Smart home
CO2, temperature and humidity monitoring for tight new homes and ADUs
New houses and backyard cottages are built tight to save energy. Tight means the air you breathe at 3 a.m. is the air you breathed at midnight. An Ajax LifeQuality monitor shows the CO2, humidity and temperature in each room, on the same app as the alarm.
Ajax LifeQuality Jeweller measures CO2 from 400 to 9,999 ppm, temperature and relative humidity. It reports to the Ajax hub and shows a green, yellow or red light. It does not measure PM2.5, VOCs, radon or wildfire smoke. Rivas Technology Group installs it in tight new homes, ADUs and mechanical rooms across the South Sound.
By Ivan Rivas, Owner and Sales Engineer · 2026-09-18 · Updated 2026-09-18
The problem tight construction creates
Every new house in south King County and Pierce County is built to a tighter envelope than the one before it, and so is every ADU under HB 1337. That is good for the heating bill. It also means the house no longer ventilates itself through gaps around the windows. Bedrooms with the door closed run high on CO2 by morning. Bathrooms and laundry rooms hold humidity. A heat-recovery or energy-recovery ventilator handles both, but only if it is set to the house's real occupancy, and nobody knows what that is without a reading.
What LifeQuality shows you
The Ajax LifeQuality Jeweller measures three things: CO2 from 400 to 9,999 ppm, temperature, and relative humidity1. Each reading has a chart in the Ajax app. The light on the device shows green, yellow or red, so a guest in the ADU can read it without an app. It runs up to 3 years on its batteries and sits on the wall like a thermostat. The Lite version drops the CO2 sensor and keeps temperature and humidity, which is enough for a server closet, a wine room or a crawl space.
What it does not do
It does not measure particulates, so it will not tell you when wildfire smoke is inside the house. It does not measure VOCs from new carpet or paint, and it does not measure radon. Smoke and carbon monoxide from a fire are detected by the FireProtect 2 on the same hub, not by this device. We say that plainly because "air quality monitor" is a phrase that promises more than any single sensor delivers.
Where the readings matter
The main bedroom and any bedroom a child sleeps in with the door closed. The ADU, where a tenant cannot see the main house's ventilation settings. The mechanical room, where humidity says whether the ventilator is doing its job. The crawl space or the basement, where a Lite unit catches the damp before it becomes mold. And the rack closet, where temperature protects the network equipment you paid for. A typical new house takes two to four monitors.
What you do with the data
Adjust the ventilator. Most HRV and ERV units ship on a low default and never get touched. A week of CO2 charts shows the right setting for the way the house is actually lived in. A humidity chart that climbs every evening points at a bathroom fan on too short a timer. If the house runs Control4, the readings can trigger it. A bathroom fan runs until humidity drops, or a scene boosts the ventilator when a bedroom crosses a CO2 threshold.
Need it installed?
Rivas Technology Group is an Ajax Systems dealer, listed on ajax.systems. We plan Ajax systems into new construction and ADUs across south King County and Pierce County from Kent, under WA electrical contractor license RIVASGL799DR. Start on the ADU page or the home security page, or book a walk-through below.
