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Hi Roger, I've been retired from the HVAC&R field for 15yrs now so some of my info will be out dated as I have not kept up with the trade since retiring. There's two Union trades that control the commerical refrigeration end of the process. The SM trade covers both the air side as well as the refrigeration side. The pipefitter trade only covers the refrigeration side as were dealing with liquids and piping. Both trades are now working together over the work instead of fighting about it, so if a large job has both air & refrigeration units then we use a composite crew of SM & pipefitters. To work with the pipefitters for refigeration you would also need to be a pipefitter as they don't seperate trades with in the trade. So to do the refrigeration side you would also have to be a pipefitter to compete with the existing work force. They do seperate the welding/brazing end of the process to just a pipewelder classification. They also preform unit control repair/install. I'm unsure who in there trade does that. A pipfitter contractor usualy will not do small commerical or residental jobs but is passed on the the plumber part of the pipefitter trade. With the SM trade, there was a different classes of tradesmen with-in the SM trade, SM layout/shop work, SM weldors, SM field installers, HVAC&R service/installers, Controls & computers, Indoor Air Quality & Energy Management. Once again your needed to be qualified in more than one field with-in the trade to compete with existing work force. As to the commerial units, where the challange and most work is, I liked controls as it was very difficult and challanged my mind. Problem was the job required 10hrs of self education every week just too keep up with the changing trends and no one wanted to pay you for this extra work. Working the SM trade, I could go home after 40hrs and didn't have to study. Most of the computer programs trouble shoot themselfs and so when a part fails the puter calls the contrator and tells them to bring the correct part and where to install that part. A really boring no thinking type of job. I would also think by now that the same applies to the refrigeration side of the repairs with very little thinking required. Your at a age where most apprenticeships cut off ,35yrs. That does not apply to hot labor demand areas. Here you might just get in most trades as they bend the rules alot. I strongly urge you too look at joining a Union trade as the non-Union pay is horrible with very little benefits. There was a huge HVAC labor glut in Phoenix a few years back where non-Union wages were $8hr with schooling and 2yrs experience. I notice that very few HVAC schools advertise now where before they had TV ads 24hrs/day. I left my e-mail open if you would like more info. As sharp as you are on air compressors, I'm supprised your not heading into that field? I always enjoy reading your posts on compressorss. Thanks! T_Bone
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