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Non-stoichiometric Nd0.5Sr0.5MnO3 (NSMO) single crystalline has been grown by the floating zone method. Their magnetic properties, magnetocaloric effect (MCE) and refrigerant capacity (RC) at near both first- and second-order phase transitions were investigated. The NSMO system goes through an antiferomagnetic charge-ordered transition at TCO ~ 152 K followed by a ferromagnetic to paramagnetic transition at TC ~ 272 K. The transition region spread over a broader temperature range at the TC but it had a narrower temperature range at the TCO. The maximum magnetic entropy change ΔSmax gives about 1.65 J · kg-1 · K-1 at the first order magnetic transition and -1.13 J · kg-1 · K-1 at the second order magnetic transition, respectively. RC is obtained and it shows much higher value about 34.85 J/kg at TC than the RC 19.06 J/kg at TCO. The slight non-stoichiometric NSMO single crystalline system raises the Curie temperature around 30 K towards room temperature without degradation of the RC and temperature span corresponding to the full width at half maximum of ΔSmax(ΔTFWHM) compared to pure single crystalline NSMO system.