I put a supercharger on it, full exhaust and a few other goodies.  1986 Porsche 928.

Craig, a dentist has spent a little more time and money on his education than an HVAC technician.

It may be worth going back to the drawing table and doing some more 'research' on google but, once you have exhausted you're search it may be wise to listen to what those who have more experience and have been there are trying to tell you... you don't have to follow it... but listening doesn't hurt, best of luck to ya. 

I'm a beginner and would like to know if you think a new 4PLEX construction (House Hacking) is better for the beginner rather than an established older property?

However, I always considered them more of a business opportunity than an investing opportunity.

If this list is exhaustive of that list then consider yourself lucky and take care of them.

It is also less work than an AirBNB.

I agree that exhaustive tenant screening is number one.

I don't have radiators or air conditioning...IndoorSmoke detector batteriesHVAC filtersFireplace sweep-outCheck toilet seat / seal tightnessDust / clean fridge coilsLint from dryer exhaust ventFlush water heaterCheck the fire extinguisher (expiration date)Check and redo grout / calking in showers / bathrooms.Quick flush shower heads and check faucet filters for hard water buildupTighten up loose nobs and handlesOutdoor / UnderClean guttersSiding & roofing eyeballCheck sump pumpLint from dryer exhaust ventTest garage door auto-reverse featureCheck window screensFix any earth to wood contact (damn you termites)Check trees for power line interference (PG&E will actually fix it for free if you call them)Annual trim up / sprinkler inspection & repairs.

I would always try to exhaust the HELOC route before going the mortgage route.