Advice needed please

Lex • 30 and TTC

So I don’t pay for my heat so keeping it up a little bit isn’t an issue but IM FREEZING! I keep my heat on 72°F and it’s warm while the heat is blowing in but like 5-10 minutes later I’m freezing and under all my blankets. I was thinking about getting under the door draft protectors but I don’t even feel a draft for one so I can’t think of why my heat isn’t sticking. It’s driving me crazy and my fiancé thinks I’m losing it because I’m just shaking and shaking I’m so cold and he’s fine. Like I said I’m fine when the heat is kicked in and blowing but like right away I’m cold again. I also can’t sleep in our bedroom unless I’m under 5 blankets and right next to him for warmth. I also can’t get plastic coverings for my Windows because they are all huge and I can’t afford the window covering. I’m just stumped on this so any advice on how to keep my house warm in the cold Wisconsin weather would be awesome.