where im at in Minnesota if a company does both plumbing and HVAC, most of the time, the name includes "plumbing and heating". Maybe its a midwest thing... But I wouldn't even consider applying for a job that requires those certs and starts at $14/hr. That would be like getting a 4 year college education and then taking a job flipping burgers. There is a lot of time invested into getting a journeymens licence in HVAC and plumbing and i don't know why anyone would spend the time and go that far to take a job that pays that little. A job requiring those certs should be well into the 20s/hr range in my opinion.