I found the following recently posted on the Kim Komando weekly newsletter:

A heating and cooling technician trained a small chimpanzee to help him. The chimp was the perfect assistant. He wasn’t afraid of heights. And because he was small, he could squeeze into ducts to work on them. Best of all, the technician didn’t need to pay him. One day, a customer called because his air conditioning was running and running. But the house didn’t seem to be cooling down. The technician examined the cooling system and found a problem in the ducts. The customer asked if it would be difficult to fix. “Nope,” said the technician. “I have a little duct ape that will fix the problem.”