Influence of vegetation on the building envelope is investigated on the example of vine species. Hygrothermal influence of vegetation formed in vertical structure on facade is modeled using the numerical analysis as well as the statistical methods. Analysis the hygrothermal properties is based on measurements of humidity and temperature between the wall and vegetation. The dependence of temperature differences were expressed as a piecewise function. The saved energy that is proportional to the energy which might be saved daily instead of its use for air-conditioning in the house was determined.