Everybody wants to get rid of huge electricity bills that have become more of menace these days. In order to improve energy efficiency of homes, offices and other places, these need to be thermally insulated. The heating and cooling devices are thought to be the problem, but the real culprit is improper insulation. The solution lies in home or commercial insulation of these buildings by adept professionals. Insulation reduces undesirable loss or gain of heat and also is also instrumental in providing acoustic, moisture, and fire resistant to some extent. Commercial insulation restricts heat flow, as a result of which one is less dependent on electrical devices for maintaining attaining optimum temperature within the building; thereby saving energy. Proper insulation of walls, ceilings, floors and gaps around doors, windows and chimneys is vital for maintaining a thermal isolation against the extremities of weather conditions. Commercial insulation provides a viable option to improve the thermal conditioning of the building spaces. Domestic establishments employing home insulation are much more efficient in terms of maintenance of a desirable thermal conditioning and energy utilization than the ones which do not. Consequently, these households are more likely to experience a reduction in their electricity bills. In home insulation, the most widely used insulating material is fiberglass, which is fabricated from strands of molten glass. Fiberglass along with the rock wool is loosely filled in the wall, floor and attic spacings. This kind of insulation also offers substantial resistance against fires, insect infestation and moldings, in addition to the efficient thermal insulation. The preexisting buildings are usually provided with retrofit insulation, avoiding the need of relocation of inhabitants as well as saving upon the precious internal space. An important point to consider before opting for retrofit insulation or new construction insulation is the insulation requirements. The amount of insulation needed can be found out with the help of an energy audit. In Commercial insulation or the Home insulation, the most important aspect is proper installation of insulation. Without proper insulation even the choicest temperature controlling devices remain ineffective and just add to the woes. It is advisable to precisely insulate the buildings for saving money and energy.