A parametrical investigation has been carried out to explore the velocity and temperature behaviour of wall confluent jets (WCJ) when used to heat and ventilate a test room, which mimics a greenhouse. This study assessed how the outdoor air temperature and supply air temperature affect the velocity and temperature profiles of the WCJ. The study also evaluated how WCJ can be used to eliminate film-wise condensation on greenhouse enclosure surfaces. Constant current anemometers (CCA) and T-type thermocouples were used to measure air velocity and temperature of the WCJ, air and surface temperature in the cooling chamber and test room. This study found that the supply air temperature affects the magnitude of the WCJ’s temperature in each region but the pattern (shape) of the dimensionless temperature is unaffected. The study also showed that both magnitude and pattern of the dimensionless temperature profiles are unaffected by the outdoor air temperature in all regions of the WCJ. The dimensionless velocity profiles under isothermal and non-isothermal were similar, but the magnitude of the profiles increased as the supply air temperature increased in the merging and impinging regions of the WCJ. WCJ formed a boundary layer of warm fluid on the nearby wall; thus, can be used to reduce condensation on the inner surfaces of the greenhouse enclosure.