High quality air temperature control can provide an excellent means for minimizing the thermal drift of machine tools and inspection instruments when other means are not practical. Improvements in air temperature control has been improved in several machining areas by as much as ten to one by the careful identification of heat loads and the application of some fundamental classical control theory.
Hans J. Hansen,
"Techniques For Precision Air Temperature Control", Proc. SPIE 0433, Contemporary Methods of Optical Manufacturing and Testing, (9 December 1983); doi: 10.1117/12.936793; https://doi.org/10.1117/12.936793