Hi everyone,I want to try renting out apartment units and then renting them out on air bnb and profit the difference between the rent and the STR income.

Another idea I had was to just use standard research out there on building systems like the air conditioning, wiring, plumbing and so on, to estimate how much time they would normally take to require repairs.Here's a paper that discusses "energy modeling" for single family homes that is pretty recent that is an example of what I'm thinking of:https://www.mdpi.com/1996-1073/12/8/1537 

I was wondering if I could list it myself through rent redi as a short term rental or should join something like Air b and B or VRBO?

Your story provides a valuable perspective for those considering real estate investing and offers a refreshing take on the necessity of expensive guru courses.It's unfortunate that many seminars and programs often present themselves as the only path to success in real estate, pressuring attendees to spend significant amounts of money on courses that may not be essential.

What do to for a small 800sft home (2 bed 1 bath) that has no central air.

A Phase I site assessment is a non-intrusive site investigation and does not typically involve the sampling of soil, air, groundwater, and/or building materials.

They stated my HVAC will actually run more efficiently without insulation - because the warm crawlspace air will rise in the winter.

There are some good PMs, but taking 10-20% off the top would make it break even at best.Here is our place - https://www.airbnb.com/rooms/606577680390071886The 'blah' places are NOT doing well and there is downward pressure on avg daily rate, but with a high occupancy rate it is fine. 

Built and installed the cabinets, trim work, sanding the stairs, drywall repair/patches, demo, pressure washing, installing new doors, fixtures, etc..

They feel pressure that they have to buy real estate and this mentality often leads to bad decision making.