I will turn the guy in, what he is doing is illegal, what he is advertising to do requires 3 licenses, by Florida statute he is required to list his license numbers in all forms of advertising, even craigslist.
HVAC
Plumbing
Electrical
Even if his boss allows him to do side work, the guy is not licensed and he can't work under his company license, unless the work is being done by the company.
I seriously doubt his company would allow him to do side work with the company van.