Carrying a long-sleeved shirt with you in case it gets a bit chilly is not unreasonable.
If it’s 21 C / 70 F outside, just leave all A/C and heating off. You don’t need them.
then they blast personal space heaters in their offices while the AC is on.
Okay, that’s more than just mildly irritating. That’s massively irritating.
They don’t harm the plant
I don’t buy this. I just caught them going through the roots of a plant with severe root damage visible. Granted, this was in combination with overwatering, but still. There are also plenty of voices in the Internet saying that, if those larvae run out of other organic material in the soil, they will start eating plant roots.
Yes, that’s probably part of it.
Fungus gnats are a common problem for me whereever I have potted plants, but so far, they haven’t managed to kill one yet. So far, I have been keeping them at bay with a combination of yellow sticky traps and, in extreme cases, an application of SF nematodes.
Okay, but which ones? The same you would use for fungus gnats?
When one of my lettuce plants started wilting, I pulled on it and found I could just pull it straight out of the soil with no resistance. On the roots, I found these maggots. (You may need enlarge the picture a bit.)
Does anybody know what these are?
How likely is it that those are why the lettuce started dying?
Can they spread to other nearby potted plants?
What can you do against these?
Years ago, we used to use Etherpad for that. Don’t know if that’s still a thing.
You still don’t need to turn the AC up to the point where some people start freezing.
IMHO, it’s not the slightest bit unreasonable to just expect everybody in the office to be able to deal with any temperature between 20C (68F) and 24C (75F) without complaining.