Gonen was busy wheeling around his carry-on suitcase with an empty Dr. Pepper can attached to the handle. He used the can to demonstrate how his Regitell decal can read the air temperature of a register when applied to the metal surface.

The decal changes its color and shape, indicating a red “R” for hot and a blue “C” for cold.

The purpose of the decal is to show the home and/or building owner if the air coming out of the register is hot or cold. The small 2- by 3/4-in. decal could be imprinted with a contractor’s name and phone number and used as a marketing tool.

Widmer had a makeshift “FixAC.com” sign rigged to his baseball cap, which made for an interesting sight among show visitors. He claims that he was getting a lot of looks with the unusual configuration on his head.

Widmer said he was tired of running his one-man hvac shop and felt it was time to climb aboard the Internet train and use his expertise to market and sell services and advice. He said he wasn’t sure what he was going to put on the Web site, but he is planning to add new items and links all of the time.

He felt fortunate to reserve that domain name and when he tried for a few more names with “Fix” in the title, he found that they were all taken. So here he is with a domain and some ideas. For information on Gonen’s Regitell, call 877-734-4835. To reach Widmer? Go to FixAC.com.