(Less likely to say something unjustifiable) As for weather the HVAC system should be replaced or fixed depends on costs.

Also, what companies or systems do you use for tracking?

Their MLS system will have ways to search that you can’t do on the public access sites. 

During the feasibility period I'm planning on conducting the usual due-diligence with a thorough inspection of all the property's systems and structures (utility services, roof, HVAC, maintenance history, lot survey, tenant interviews) along with a Phase 1 ESA. 

Wondering what the best online application system is for tenant screening?

The major systems to note for CapEx are foundation, electrical, HVAC, and plumbing. 

That comes from a good (great actually) wholesaler.The real problem in my mind is the gurus who preach and teach that anyone can wholesale with ease with no money and no credit so long as they buy their system.

Older heating systems can be up to $10k per unit. 

A good video surveillance system supplements human guards to be more impactful—but cost-effectively.

@Mark Berge - My HVAC contractors don't like using Home depot systems because they don't stock the parts needed to fix it if something happens.