R-value is a measure of the material's resistance to conductive heat flow. In other words, it is how well the material absorbs heat. The higher the value, the less heat the material absorbs from the inside and outside of your house.
These values will be already calculated for you by the manufacturers. It's a good idea to take your wall and ceiling insulation into account as well because it covers over 70% of the surface area of your home. Misaccounted window insulation will result in warm air slowly escaping to the outside through surfaces such as windows and insulation materials.
What is insulation?
Insulation acts as a barrier between the air, moisture, etc. in your house and the air, moisture, etc. out of your house. This is what helps houses maintain roughly the same temperature for longer periods of time. Without it, air-conditioning wouldn't be as effective as air would escape outside and your air-conditioner will work harder to keep your home cool. Because of the increased stress on your air-conditioner, it makes your ac more prone to failure because its designed to have a certain capacity/lifetime
Technicalities of R-Values
The heat flow is measured in terms of its thermal resistance(R-value). Therefore, the higher the R-value, the more effective the material is at retaining heat inside your home.
The R-value depends on the material type of insulation, thickness, and density. Additionally, for some materials, the R-value depends on temperature, aging, and moisture accumulation.
When installing more insulation in your home, the R-value is increased and the resistance to heat flow. A general rule of thumb is the insulation thickness size will proportionally increase the R-value. However, there is a catch. As the