Colin came back for another visit and brought more sensors. He also brought his professor, Rodgrigo Mora of the Faculty of Building Sciences at the British Columbia Institute of Technology.
These new sensors measure temperature, relative humidity as well as CO2. Until now, we have had only one CO2 monitor in the house, the one in the kitchen. It needs to be plugged in. These ones run on batteries and report their data wirelessly. We even added one to the basement to get a complete picture.
Part of my hope for the retrofit is to install a Heat Recovery Ventilator. The HRV will circulate the air throughout the house, keeping us healthy and comfortable. As the house is now, the air and heat does not circulate well–the top floor is cold in winter and hot in summer.
I’m interested to see if the CO2 levels fluctuate along with the temperature. Is the CO2 level higher at night in the bedrooms when we’re doing a lot of breathing in there? Is it higher in the kitchen when we’re doing a lot of cooking? What about humidity? When the kids are in the bath does it shoot up and send moist air into the attic space above?
These larger, wireless sensors are designed by SMT Research, a Vancouver company. On his last visit, Rodrigo was surprised at how quickly they went through batteries, but they work great!
By the way, there is a BCIT Building Science Department Blog that you should check out.
Stay tuned for more on how this old house fluctuates in heat, humidity and CO2 levels and why. Remember Nichole Wapple, the Building Science student who teamed up with Colin to use the data from our house for her own project? Well, she has completed a preliminary data analysis and given me permission to share her findings with you.
Now, I just have to find the time…