Vanadium dioxide, VO2, is the most promising thermochromic material with a drastic change of its infrared transmittance across the metal-insulator transition. However, a high metal-insulator transition temperature, Tmi=68°C, in conjunction with a low luminous transmittance impede industrial applications of VO2-based smart windows. To address these issues, we utilize binary VO2-TiO2 nanocomposites, which allow us to reduce substantially Tmi of VO2 owing to strain generated at heteroepitaxial boundaries between VO2 and TiO2 nanocrystals as well as to increase the luminous transmittance due to a perfect transparency of TiO2 as a second oxide phase. The binary VO2-TiO2 thin films were deposited on fused silica substrates by the metalorganic aerosol deposition (MAD) technique from common solution contained both precursors of V and Ti. The deposition was performed at controllable oxidation, which is prerequisite for synthesis of a single-phase VO2 owing to a variable valence of vanadium. Scanning electron microscopy proved deposition of continuous and dense films composed from homogeneous nanocrystals with irregular shape. But X-ray diffraction analysis revealed formation of a metastable V1-xTixO2 solid solution in spite of limited miscibility in VO2-TiO2 binary system at conditions of equilibrium growth. The solid solution films display absence of the metal-insulator transition both in temperature dependent resistance and optical transmission. To achieve the required separation of VO2 and TiO2 phases we applied a low temperature annealing, which is proved to be effective for VO2-TiO2 phase separation by means of spinodal decomposition [1]. After 550°C annealing of the V1-xTixO2 solid solution films with x=0.35 the metal-insulator transition was emerged both in resistance and optical transmittance dependences from temperature. Moreover, the transition occurs at temperature of 321 K that is ~20º lower than for unstrained VO2.