Repair old door with minimal money. I edited and isolated my old front door, which penetrates the cold from corridor. The total cost of around 10,-€
At first make thin profile wood frame around closed door. Screw it.
The next step is to stick a thin insulating material.
Next alignment of inequality and excess glue.
We will need some decorative nails and inexpensive tablecloth on the table.
Tablecloth translate the width of the wooden profile. We begin in the corner, follow the sides. The material must be evenly tensioned.
On the door handle i used metal ring.
If you will work exactly the perimeter doors are tight fitting to the frame.