The earth goes through natural heating and cooling cycles every 100 years or so.That said the link you showed, at high emissions, only says an average of 2% of the properties will be under water at high tide in 40 years.

I’ve bought properties with 1 year old heating units.

The most important element is for you to get experience as an owner under your belt and to reduce the pressure of making monthly rent payments, but may not eliminate them entirely.

With real estate being an arm of the law I think the human element is something technology will never completely replace.

The issue is that those units also give out heat.

Click that, and a map will come up showing a crime heat map. 

What kind of heating system-gas or electric forced air, heat pump, electric radiant?

Those are two critical elements to understanding the value of a home.If you want accurate comps, find a Realtor *with experience in that neighborhood* who is willing to help. 

So, focus your energy on those two elements and you will be just fine.  

The roof is new and the heat and air (two units) one is 7 years old and the other 4 years old.