The money spent on insulation can also pay for itself gradually in the form of much lower utility bills (heating and cooling costs). Determining how much you will save is not easy, as it depends on a number of factors. Calculations must take into account the size, layout and orientation of the property, the condition of the windows and windowsills, the existing insulation, the parameters of the insulation system to be installed (thickness of insulation, materials chosen, method of installation, etc.) and, last but not least, current energy prices. Simply because of the lower heating bills, retrofit insulation of an average family house can pay for itself in 3-5 years.

A significant part of the investment cost is the contractors' labour costs. It is not worth saving money on this, as a poorly constructed insulation system with inadequate expertise can cause damage and repair costs that can cost significantly more than the labour costs you were planning to save. 

The other significant part of the cost is the cost of materials for the insulation boards. The quality of the insulation boards determines the energy performance of the building, its future value and the savings in running costs. Therefore, when planning insulation works, the type and thickness of the insulation board should be chosen carefully. The choice of the right material should take into account the type of wall structure and the environment in which the board will be installed. When determining the thickness, the level of energy efficiency to be achieved should be taken into account. Using a standard EPS board twice as thick will increase the investment costs by about 15%, but the energy savings will be around 40%. If normal EPS and graphite EPS of the same thickness are used, the costs increase by about 10% when using graphite EPS boards, but the energy savings are around 15%. 

The remaining part of the investment cost, around 23%, is due to the material costs of the system adhesive, the colouring plaster and the ancillary products. This also covers the cost of the system adhesive for fixing and protecting the boards, which is about 3% of the total cost. Choosing a cheaper but poor quality adhesive does not significantly reduce the costs, but it can also make it easier to damage the whole insulation system and thus the façade. 

The use of anchors, which are a range of complementary products, can provide a thermal insulation system with sufficient stability and therefore a longer life span. The various profiles also belonging to this category ensure a beautiful, aesthetic appearance of the edges and, in some cases, a watertight connection between the different structural elements. They cost a fraction of the total investment, but provide a more durable and aesthetic thermal insulation system.