In this Letter we describe the effect of heating on the quality, morphology and nonlinear optical efficiency of anisotropic Langmuir-Blodgett films composed of a chiral helicenebisquinone derivative. The samples were studied with second harmonic generation (SHG), UV-Vis absorption spectroscopy and atomic force microscopy (AFM). Heating a Langmuir-Blodgett film of a helicenebisquinone derivative improves the film quality (homogeneity, surf;tce smoothness). In addition, it increases the film's anisotropy and, as a consequence doubles its nonlinear optical efficiency.