All of the windows in this house are horrible and leak air. We have tried covering them with the insulating plastic wrap but this is what happens. It’s useless.
So I thought I’d try this hack: bubble wrap. Not perfect by any stretch but doable. (Guess what? It didn’t work.)
And I did the same thing in the master bedroom to my window plus put a towel over the crack because the cold air was just pouring in.
The house couldn’t get past 64° with the furnace running all day (it was 61° when I got up, and it should have been 72°). Long story short—after some texts to the landlord and an HVAC guy—our problem was the furnace filters!! We had expensive 3M allergy filters and he said those were the worst thing you could use and to take it out immediately. We did, and the house heated up to 68 within two hours. Lesson learned.