The analysis of the MERRA data performed for years with different ENSO phases shows that development of Sudden Stratospheric Warming (SSW) events under El-Nino and La-Nina conditions proceeds in various ways. For instance, the zonal mean flow averaged over mid-winter months is stronger and polar temperature in the lower stratosphere is colder in years with La-Nina. To consider the ENSO influence on the dynamical processes in the extra-tropical middle atmosphere, the semi-empirical parameterization of the atmosphere heating due to latent heat release that takes into account diurnal and longitudinal variations has been developed and implemented into the Middle and Upper Atmosphere Model (MUAM). The latent heat composites for Northern Hemisphere winter months under El-Nino and La-Nina conditions have been calculated using MERRA precipitation data. The corresponding composites of geopotential height and temperature at lower boundary have been constructed using the JRA-55 reanalysis. The ensemble runs consisting of 10 members for the El-Nino and La-Nina events have been carried out. The comparison of the results demonstrates that the stratospheric polar vortex tends to be weaker and polar region in lower stratosphere is warmer during El Nino winters. The composite amplitudes of Stationary Planetary Wave with wave number 1 (SPW1) are weaker at higher latitudes in the stratosphere under La-Nina conditions while the SPW2 behaves opposite way and has stronger amplitudes. The influence of the noted distinctions on the efficiency of stratosphere-troposphere coupling and possible manifestation of the precipitation efficiency trend observed in the recent decades on the upper atmosphere are discussed.