The subject of this master's thesis is warm air heating system. The task is to apply this heating method to a specified building and to design technical solutions. The degree of completion of the extended project is appropriate for the requirements of building permit documentation. Proposed solutions were evaluated in the viewpoint of inner environment, space requirements, operation economy and environmental impact. Warm air heating system made by Atrea is used for building heating. The text part of the thesis deals with building air permeability and the experimental part describes performance of blower door test in a family house and evaluation of experiment data