HVAC professionals are gaining trust with customers when they use theST ProPlusmodel thermometers to show them exactly where they are losing heating and cooling. Studies have shown that more than 30 percent of air conditioning leaks into an attic or crawl space due to faulty ducting.

Raytek Corporation, 1201 Schaffer Rd., P.O. Box 1820, Santa Cruz, CA 95061; 800-866-5478; 831-458-1110; 831-425-4561 (fax); www.raytek.com/proplus (website)