> Probably obvious for many, but I didn't realize ACs don't transport any air into the room, but just moves it around

I had the same epiphany as you days after acquiring a CO2 monitor. Most people notice poor indoor air quality from proxies such as humidity and temperature. AC (without ventilation) eliminates these and tricks our senses very effectively, giving us cool and fresh feeling indoor spaces full of CO2 and devoid of oxygen.

I can see the value of doing this but I think that this is a case of the 80-20 rule. Just the low effort 80, which could be keeping a journal where you reflect on how you felt a given day, why that might be, and what steps to take to avoid it from happening (or keep it happening) should get you pretty far.

Most of the things that really hinder my productiveness and happiness are the same things that everyone tells you about; sleep, diet, sunlight, not being stuck indoors all day, socializing. And most of these can be improved by making changes to my habits.

Other than that, is that I think that it's important to get into the habit of self reflection. Having a feedback loop on my own life has helped me find out what works and what doesn't. It's too easy to just go through the days slogging through and not making any changes because you don't even realize what's going on.

That last takeaway "it's not worth it" hits hard.

I went through a similar process and came to the same conclusion, although with a slightly different twist. The project became the point and I almost stopped noticing the data towards the end.

The value rarely shows up where you expected it to.

I kept a rough log of my sleep and mood for about a year with no specific goal. Mostly forgot about it. Then I had a weirdly bad few months and went back to look — turns out there was a pretty clear pattern I would've never noticed in the moment.

Maybe the framing of "was it worth it" is the wrong question. It's less like an investment with a return and more like keeping receipts. Useless 99% of the time, then suddenly you really need one.

This was far more interesting than I first thought it would be when clicking the link. In particular, the place/time and life events and such being presented this way told a story and was fun.

This looks like it requires a heavy amount of discipline to track everything consistently over time. How do you build that into your daily routine?

Tangent, I've always had notes and have this longing to store things but at the same time I like "moving on" too. For ex. I used to have windows phones and saw I still have an accessible One Note from 10 years ago... tempted to read through it but also I've changed as a person.

Another tangent, recently bought a paper shredder, started shredding through boxes of mail I have kept since they have personal info like cc statements but on the same idea of moving on/reducing stuff I'm hoarding whether it's data or physical.

The hardest part of this kind of personal data system is retrieval not storage. At some point you have more data than fits in a prompt, so you need to decide what's relevant per query. Did you build any ranking or filtering logic, or do you query specific tables directly?

Flying stats dashboards always amuse me. I get it, for the non-pilot it's kind of like a status thing, "Well I traveled X times in 2025!". As a pilot though, I have gobs of stats I could put up there but from flying for 15 years I realize there's not really anything meaningful in there other than "Gee whiz, I flew a little more/less than last year." I know some other professional pilots do track some of their stats a little closer as they try to optimize for hours flown:hours paid but I've never cared to hyper optimize my schedule in that way.

An interesting experiment, I think I'm too uncomfortable leaking data I don't yet know why someone would curate to me free of charge until I knew. If there was a FOSS suite like Home Assistant that would do a few of those things I might try it out, especially the weather (I would add air quality) correlation to mood and other subjective states.