I am trying to come up with the best way to prevent illness for extreme no generator runs for New Home. I previously finished one with 91 souls, and just now one with 71 souls. The inability to treat people at the end is brutal.

Infirmaries/Care houses have a base heating level of 2, 2 from research, 3 from heaters, but get disabled at -100c. When a building is disabled, its heater is disabled also. This is a problem for industrial hothouses, which have a base heating level of 2, 2 from research, 3 from heaters, 1 from field kitchens. Unfortunately, field kitchens do not heat medical buildings or houses. Houses themselves have a base heating level of 3, 1 from research, which is annoyingly poor. Gathering posts have a base heating level of 1, 2 from research, 3 from heaters, 1 from field kitchens. This will be freezing at -120c.

The only other alternative is the prison. The prison has a base heating level of 3, 3 from heaters, but runs 24/7! This means it is warmer than the houses! The prison will become freezing at -110c. You can't use field kitchens if you have a prison, but no buildings exist where you would need one anyway. Prisoners can't be treated by healthcare, but the healthcare is disabled by this point anyway so it doesn't matter. So one strategy could be do build 15 prisons and go ham at the end.

An interesting alternative to houses would be to run emergency shifts of every workplace, using the gathering post strategy, 3 days before the storm's end. Once someone is sick, they will die in 2 days so this will try and keep them a little warmer than they would otherwise be. Workplace accidents might be a pain though. Faith keepers would definitely be needed to break up protests, this will raise discontent to around 1000%.

Another trick is to use triage just before infirmaries are disabled. If you don't, those people are dead anyway.

I don't know if there is any difference in the chances of people to get sick in different levels of freezing. For example, a house is warmer than a tent, but at -120c both are freezing so is it the same likelihood of getting sick in each?