I have a feeling you blew that shot. Just for future reference, when an employer ask you what your goals are do not say refrigeration unless they are a refer company. Nothing against you but if I were that employer I wouldn't hire you knowing that as soon as a better refer job came up you would be gone. Just tell them you would like to be the best at the trade that you can be. Who knows you may land with a company that does both and get best of both worlds. Good luck. Call the guy back and take the job. Even if in your mind it is only temporary. It may turn out great.
You need to put the phone down and get back to work!