The heat and cold radiate through exposed walls of the house. There are following methods of thermal insulation of exposed walls. 1. You may provide suitable thickness of wall.2. You may provide Hallow wall or cavity wall.3. You may fix Hardboards or ply board on wooden batten over the wall for creating air space.4. You may fix Thermal insulating material sheet inside and outside exposed wall to reduce heat/cold transmission.5. You may construct outer wall with thermal insulating material if you have frame structural building or non-load bearing walls.