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The current research considers the principles of selection of the climate information needed for the building envelope and indoor climate design and adopted in Russia and some European countries. Special reference has been made to the shortcoming of methodologies that include the notion of a typical year, and the advantages of climate data sets generated via software-based designs, using pseudo-random number generators. The results of the average temperature of the coldest five-day period with various supplies were calculated using the numerical Monte-Carlo simulations, as well as the current climate data. It has been shown that there is a fundamental overlap between the statistical distribution of temperatures of both instances and the possibility of implementation a probabilistic-statistical method principle in the development of certain climate data, relative to envelopes and thermal conditions of a building. The calculated values were combined with the analytic expression of the normal law of random distribution and the correlations needed for the main parameter selection. Santrauka Straipsnyje nagrinėjami informacijos apie išorės sąlygas atrankos principai, reikalingi pastato patalpų mikroklimatui sukurti remiantis Europos šalių (ir Rusijos) patirtimi. Dėmesys atkreiptinas į metodikų trūkumą, kuriose vartojama „tipinių metų“ sąvoka, ir į klimato duomenų rinkinių, įtrauktų į programinę įrangą, privalumus. Vidutinė šalčiausių penkių dienų temperatūra buvo apskaičiuota taikant skaitmeninius Monte Carlo modelius ir dabartinius klimato duomenis. Buvo įrodyta, kad abiem atvejais temperatūros statistinis pasiskirstymas iš esmės sutampa ir yra tinkamas pastatų atitvaroms ir mikroklimato sistemoms projektuoti. Apskaičiuotos vertės buvo įvertintos atsitiktinio pasiskirstymo metodo analitine raiška ir pagrindiniam parametrų pasirinkimui reikalingomis koreliacijomis. Reikšminiai žodžiai:pastatas; atitvaros; šildymo sistema; mikroklimatas; projektinės vertės. &nbsp

The main aim of the work is to investigate unsteady indoor thermal factors’ influence on premises microclimate, energy demand and installed heat power. Tasks of the work: 1. To investigate evaluation methods of thermal characteristics of a building which have influence on unsteady heat transfer, and to point out the main and determining factors. 2. To investigate dynamic thermal characteristics of a building in an experimental way. 3. To describe unsteady heat transfer processes in buildings on the basis of energy conservation law for a control volume with the help of active heat capacity conception and to adapt calculation methods for practical use. 4. To estimate the influence of active heat capacity on premises microclimate, design heat power and energy use.