And also:There is so much to learn and I'm feeling a little unfocused in my information consumption, and don't want to miss anything important before jumping into my first deal(s).

I haven't found any "plug and play" meters for an already existing heating system - I imagine you'd need to monitor gas consumption, and each unit's thermostat would meter the valve.

from a time consumption perspective?

I worked day and night going without sleep while maintaining an unhealthy consumption of energy drinks.

Here's a link to a good & readable article in re Series LLC's:  https://www.forbes.com/sites/jayadkisson/2018/06/1...Here are a few interesting quotes (bolding & underlining are mine):  "For these reasons, the Series LLC is not an entity for general consumption, for the do-it-youselfer or even the average LLC planner who is inexperienced with Series LLCs.

Once consumption is in line, you are open to rent reduction.

These are all questions whose answers will help you chart the way forward ... there is no one size fits all answer.From an operational perspective it is always pleasant to know that your building envelope is relatively efficient (insulated and air sealed); that building systems (electrical, plumbing, HVAC and communications are up-to-date and dependable) and that you have the ability to put accountability for resource consumption in the hands of the tenants.  

If so, you can bill back water/sewer consumption (increasing the NOI and cutting one of your largest expenses)  but you'll want to see if that's common practice with your competition and ensure rents line up as well.

You need to account for: Lawn care ($25-ish x 20-ish mows per season)Snow removal ($25-ish per plow x 20-ish plows per season)Water/Sewer: ~$240 per quarterHeating oil: Stated oil consumption in the listing is 730 gals annually - I'd confirm this with the fuel vendor if you can.

Most solar engineering software accounts for average weather conditions for your zip when sizing the required system to offset your electric consumption.