This heat is killing me.

Desiree
Living in an old house is cool sometimes but right now is definitely not one of those times! It's 20 degrees outside and the heat is on 70, which means it's nice downstairs. But upstairs is hell! It's so hot. I've closed the vents and cracked my windows (but the windows in our room don't have screens so I can't open them more than a few inches or else my cat will get out) but it's just SO hot. And SO DRY!!! Which is the worst!! I can't take it. My lips are cracking, I can't breathe at all, I'm so uncomfortable. I'm almost 34 weeks pregnant and I already have issues sleeping 😩😩😩😩😩😭 
Do you think a humidifier will work? Never really used one. Has anyone else?