Interactive 3D application dedicated to the theme of revitalizing prefab houses. In real time visualizes proposal of a new color/aesthetic solution of the house and its elements (facade, balconies, base, etc.) in any desired color. At the same time compares the proposed condition with the original and allows view from any distance or direction in 3D. A part of the application is also an example of comprehensive interactive guide feature for explanation of the issue of heat loss accompanied with suggestions and examples of correct solutions. Amount of components covered by the guide will be extended with the release of further versions of the application. Besides the possibility of 3D diagrams of each floor of the house, there is also an overview 3D model based on the thermovision images of the house to study.