Be careful. Photochromics gave me (well, helped a lot in giving me) a horrible case of SAD. And when I mean horrible, it was way worse than moderate depression. 15 years later and I still have a habit of installing ridiculously powerful lightning everywhere just to make sure it never happens again.
I go with magnetic clip-ons these days. I accept that I’ll break/scratch/lose some, and just keep one in my back pocket and in my car.
I’d personally rewrite this article as a “get an AC unit, now!”, with links to the cheapest brands that are worth it (probably any with an inverter), then add a few tips on using it. For example the cause of most issues is simply setting the temperature too low. In summer it’s ok to put it on 25C, then “lose” the remote until autumn. Maybe lower when/where you sleep. Also it seems obvious to me, but for completeness’ sake: don’t install it where it blows on you often, and ideally not in the room you sleep. If you need to sleep with the door closed, then spend more than 5 minutes figuring out exactly how you want the airflow in that room. Some AC units come with a Night or Quiet mode—it’s worth it in the bedroom.
Then put the rest of the article as emergency measures until you can get an AC unit installed.