151–160 of 322 posts
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There was an NBA coach who use to obligate his players to sleep with at list some inches/centimeters of air access in their windows hotel rooms the night before playing an important game/match. Don't remember what Team.
Surely he'd have to tuck them in at night to verify that...
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Can’t speak for OP but I’ve been using the IQAir Air Visual Pro and can support everything they’ve said. I try to keep CO2 around 400-500 in my office and home but it spikes surprisingly fast with even one person breathing in a medium sized room. It can integrate with HomeBridge and has a good API and unlike a lot of IOT stuff it’s well supported and stable.
do you know how accurate it is?
Can’t seem to find the report but to be honest I stumbled on it while searching for PDFs on the subject a year or two back. (I own no stock nor have any affiliation with IQAir - just a satisfied customer - high price not withstanding).
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There was an NBA coach who use to obligate his players to sleep with at list some inches/centimeters of air access in their windows hotel rooms the night before playing an important game/match. Don't remember what Team.
Colder temperatures also generally help people sleep.
Any implications at a bigger scale, i.e. considering rising global CO2 values?
I was lucky to get my hands on 5 proper co2 sensors from university, while I was teaching and working. So plenty of test places. What I found: -Just a couple of hours in a office, without ventilation spikes the co2 enough to make everyone dizzy and tired by the end of the day. Keeping eye on the meter and ventilating properly, increased everyones productivity and people werent so tired by the end of the day. - Classr…
As someone who has built my fair share of houses and worked on many more over the last 25 years, I have to agree that our ability to seal air better than ever is causing problems, especially if you don't have forced air heating and cooling running all the time. People just completely ignore or haven't ever thought about room ventilation, positive or negative room pressures, and where and how to ventilate to the outsi…
I recently added A/C cooling to a previously heat-only house, and I took the opportunity to ask the company to explain some quirks in the existing system, like how the ventilation fan in the laundry room is on the same breaker as the central heating, and had a hidden timer attached to it.
The house was built (early 1990s) with a particularly powerful vent fan in the laundry room which was on (regardless of the wall switch) a certain number of hours a day, and the forced-air system had an air intake outside the house which mixed with the return air before hitting the filter.
This was all sized such that all the air in the house would be replaced about once every 24 hours, according to WA state's VIAQ ("Ventilation and Indoor Air Quality") code.
That's all been superseded by the International Mechanical Code and International Residential Code.
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I don't think that's quite true. The efficiency merely falls to 100%. (The laws of thermodynamics demand it.) Now, converting electricity to heat may not be as cheap as converting, say, natural gas to heat (thus making the heat pump un-economical when not pumping any heat)... but you do get heat out of it.
That's true. But heat pumps don't have the gross energy capability as a gas heater. To get the equivalent of an 85,000 BTU gas furnace you'd need to be pumping 25 kW through your heat pump at that point.
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413ppm is now ambient. Goes up higher every year (with a small amount of seasonal variation). By 2100, we may be at 800ppm if we continue and/or accelerate fossil burning (4 degrees C trajectory). https://www.co2.earth/2100-projections Already a middling stuffy room, and would increase indoor levels 400ppm over today.
I wonder at what point will people have active systems to lower their CO2 below ambient in their homes.
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As someone who has built my fair share of houses and worked on many more over the last 25 years, I have to agree that our ability to seal air better than ever is causing problems, especially if you don't have forced air heating and cooling running all the time. People just completely ignore or haven't ever thought about room ventilation, positive or negative room pressures, and where and how to ventilate to the outsi…
And I recently remember hearing forced air is bad for air quality inside! Did I hear wrong or is there something more to the story like “forced air brings in outside air, so if your outside air is bad you’ll have trouble”?
With every similar news I feel dumb. Because my parents and my grandparents used to say same things. It was easy to dismiss all the advice as grumbling, but I really should refresh air before sleeping, humidify air in heating season, eat more vegetables... etc. etc.
Drinking cold drinks in winter makes you cough.