We insulate the walls with gypsum plasters
Each person always dreams that his house would be warm enough and comfortable. That is why he will need to insulate the walls. This can be done using various materials, including using drywall. This material has a low cost, so everyone can buy it. Recently, a greenhouse from PVC has been made by special firms.
You need to start warming your house from doors and windows, but only after that start insulation of the walls themselves. Before you use drywall sheets, you will need to put an additional layer of insulation. Mineral wool, which is environmentally friendly.
In order to fix mineral wool, you will need to design a metal frame. Vata will be placed in the intervals of this frame, and gypsum plasterboard. The use of such insulation is quite effective, but you will deprive yourself of a few centimeters of your space.
If you are not ready to say goodbye to such centimeters, then it will be possible to simply use drywall sheets that will need to be glued to the surface of the walls.