They are funded by short term deposits so they want to make short term loans so they are matching duration of assets to liabilities.

If you are taking HELOC for short period of time its fine but if its long term its not worth to pay high interest rate. you can always go back to 30 years loan.  

In my short investing career I have learned not to wait until system breaks in getting it replaced.

It seems like you really have developed a good understanding of real estate in a relatively short time from all while maintaining a full time job as an engineer.

Long story short, in the inspection period, I noticed that the the bed was against the wall during the pictures in the master bedroom for the internet.

Most people hate the situation after a short period of time.

Life is short!

In the long run, heating the building to 60 degrees and having the tenants cover the rest would probably net you less overall(that's a guess without doing any calculations) but if you plan to own the building for a short period, say 5 years, I would absolutely go for a central heating system set a certain temperature, with the tenants covering the rest to bring it up to a comfortable zone.

LOL  A lot of interpretation of my short sentence here.A gutted property will require a lot of rehab and a lot of permits. 

In my experience, my tenants are human, they pay late sometimes and are short on money sometimes.As a property owner, it's your responsibility to send them notices that they need to pay, not only does this protect you, but it protects your customer, your tenant.