Some processes in the home are so necessary that it can benefit in the long run for example: termite treatment, sealing proof paint etc. a considerable insulation process can reasonably reduce the overall utility bill, home becomes energy efficient and things can be controlled in a reasonable way.
There are some common elements of this strategy: the type of insulation material, how it is installed, where it is installed, and how much needed. Insulation actually saves from heat during summers and from cold during winters, it is necessary especially in weather extreme countries like Russia, Canada and Pakistan (for summers). It allow the walls and roof to relax in terms of adjusting during extreme cold and extreme hot weather, as per the study ceiling insulation in Gippsland program saves 80% of the utility bills. One can easily protect the insulation of the house by stopping energy loss via the doors, windows are sealed or are well insulated, consider double glazing, use window dressings to assist, fill any crack floor gaps, and insulate the loft, build drywall over “cold wall”. The indication of good insulators when the heat energy cannot flow through them they are like fiberglass and plastic foam are placed between the cavity in the walls ceiling and building. There is a common understanding if insulation can be applied on the existing walls? Insulating involves opening the dried walls (tearing the walls) and ads spray foam inside it in order to apply thing properly. Moreover drills are also used in order to feed inside the walls so till now insulation facility is not available for existing walls (yes new walls can be facilitated from it).
The best insulation material is fiberglass, mineral wool which actually refers to different types of insulation, cellulose, polyurethane, polystyrene also known as (Styrofoam). Generally to insulate the wall exterior walls will cost approx. $3000 to $7000. Usually highest R value in insulation industry is vacuum insulated panels which has the highest R value, approx. R-45. It may seem harmless to a naked eye but if human being touch it may harm badly as it contains thousands of small shreds of glass and sand which can badly harm the skin of human being, if erroneously or by incident one touches the insulated walls (especially freshly insulated) then it is better to consult the doctor immediately or else repercussions could be severe, for example: fungus, skin infection etc.
Although in some countries it is not very common to insulate the house as it is not really needed. Countries like India and Pakistan where weather is usually hot it can be beneficial but it is not very common there at all. Cost is reasonable but the benefits are amazing like mentioned before insulation helps in both extreme weather.