The effect of various attachment technologies of aluminum fins to the carbon steel core tube on the airside performance of finned tube bundles has been investigated. The experiments were performed on four staggered six rows finned tubes bundles placed horizontally in the test section 360x360 mm. In each tube bundle, different types of tin-tube junctions were applied: G-type with a metal strip embedded in the core-tube groove, E-type bimetallic finned tube obtained with colds rolled extruded technology, KL-type with metal strip wound on the core tube with knurled surface and L-type with metal strip wound on the core tube. The airside heat transfer coefficient (h(g)) was calculated with the epsilon-NTU method described elsewhere. The following graphs were plotted: The friction factor (f(f)), Nusselt number (Nu) and Colburn factor (j(C)) vs. Reynolds number (Re-max) The airside heat transfer coefficient (h(g)) vs. pressure drop (DeltaP), and h(g) vs. goodness factor (DeltaP m(g)/(p(g)A). As it can be seen from Figures 4 to 7, the E-type tube bundle gives higher values of airside heat transfer coefficients than those for other types.