Recently published studies on the usefulness of reflective hutch covers:
Binion, W. R., T. H. Friend and G. A. Holub. 2014. Usefulness of an aluminized polyester film for reducing heat in polyethylene calf hutches. Int. J. Biometeorology. DOI 10.1007/s00484-013-0783-3.
Carter, B. H., S. M. Garey, T. H. Friend, J. A. Sawyer, M. B. Alexander, and M. A. Tomaszewski. 2013. Efficacy of reflective insulation in reducing heat stress on dairy calves housed in polyethylene calf hutches. Int. J. Biometeorology 58:51-59. DOI 10.10007/s00484-012-0623-x.
Friend, T. H., J. A. Haberman and W. R. Binion. 2014. Effect of four different reflective barriers on black-globe temperatures in calf hutches. Int. J. Biometeorology. DOI 10.1007/s00484-014-0810-z.
Haberman, J. 2015. Biological effects of hutch covers in reducing heat and cold stress in individually housed dairy calves. M.S. Thesis, Texas A&M University.