Pastatu apšiltinimas, renovacija nagrin(jama jau daug metu, tai aktuali tema daugelyje šaliu. Renovuotuose pastatuose maž(ja šilumos suvartojimas, did(ja busto kaina. Darbo tikslas – nustatyti šilumos taupymo daugiabuciame pastate galimybes gerinant atitvaru charakteristikas, galimybiu analizei taikant ArchiCad EcoDesigner programini paketa, nustatyti programos galimybes, parenkant renovuojamu pastatu atitvaru charakteristikas. Pastatams pritaikomi trys energijos taupymo paketai: standartinis, vidutinis ir maksimalus, paketai lyginami tarpusavyje. Darba sudaro 6 dalys: ivadas, trys skyriai, išvados ir literaturos sarašas. Darbo apimtis - 69 puslapiu be priedu, 68 paveikslas, 11 lenteliu, 35 literaturos šaltiniai. / House heating and renovation has been the topic of research for many years and is an important issue in many countries today. House renovation brings savings over a certain period of time and it is very important that the resident would feel the benefits. The purpose of this work is to identify heat saving posibilities in multi-storey houses by bettering the characteristics of external house walls, comparing them to the ones of houses under renovation and by using the ArchiCad EcoDesigner software package for the possibility analysis establishing the capabilities of the software package. The houses are introduced with three energy saving packages: standard, medium and maximal, the packages are compared with each other as well. The work consists of 6 parts: Introduction, Three chapters, conclussion and the bibliography. The volume of the work- 69 pages without apendixes, 60 picture, 9 tables, 35 bibliography.