I’m having a hard time deciding as well.

But, I found a bit here:  https://www.awc.org/pdf/education/mat/AWC-MAT230-Glulam-2hr-150530.pdfThe aluminum I-beam properties are well documented here:https://www.aluminum.org/sites/default/files/ADM2010Errata2.pdfIn short, one can't make a definitive conclusion. 

This will bring you to the spreadsheet as well as the video on how to use it.  

Best ways to learn about real estate is to work in this industry

A well written management contract should clearly spell out what is expected of both the PMC and the owner, to PROTECT both and avoid misunderstandings.

Any other local industries with short term employment?

Something that will help shed some light on this is reading Garrett Sutton's book "Start Your Own Corporation" as well as Robert Kiyosaki's "Rich Dad's Guide to Investing".  

Well, you need to start by buying value add properties.

Also, most decent STR property managers will be happy to offer projections for properties, or even realtors who do a lot of STR business as well. 

We are in central PA as well and while A/C is a plus, most homes do not have it and rely on window units for the dog days of summer.