Good point timebuilder, and those server rooms too!
It seems to me the job market is open in HVAC. The ads in the metro papers always seem to have 5 or 6 running for techs.
The local community college has curtailed it's HVAC/Refrigeration programs because of low attendance and budget slump. It's almost as though fewer young people are interested in trades than years ago; so turnover in the next 5 to 10 years could be an issue.