PALM DESERT, Calif - Bill Shaw blamed his raspy voice on Texas tumbleweed allergies, but it just might have been that he picked up a cold on the plane. But, which plane? Aside from the trip to the desert for the Heating, Airconditioning and Refrigeration Distributors International (HARDI) 2006 Annual Fall Conference, Shaw spent a lot of time on airplanes as HARDI’s 2005-06 president of its board of advisors.