Thermostat is all the way up but apartment is still freezing. Help?

It's all fixed now thank you everyone! The temperatures for the next week are a lot higher thankfully so we'll be a lot warmer!

It feels like 7 degrees here and the past few days it's gone down to feeling like -16. I've had the thermostat as high as it'll go but it's freezing in here. The night it was -16 we were all warmer than we are now and it's 23 degrees warmer than it was. I can't do anything to the insulation but could something be wrong with the heaters?

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SteelHands · 61-69, M

Humans are already 98.6 degrees. Reach deep into thinking about this. Everyone suggests adding heat, sealing up doors and windows etc.

But the puzzle isn't that hard to solve. Cold air is heavier than warm air. If you have ice cold cielings you're going to have cold floors. Even if you have a furnace pushing heat, convection of the air will spill ice cold air down along the walls for you, while collecting a nice hot foot thick blanket up in the middle of the rooms ceilings.

I know my thermodynamics folks. Don't CO2 yourself to death with the oven or waste time with plastic on walls. You'd be better off having plastic over your ceiling since that's where all the cold air is coming from.