I plan to do a few mini educational short video clips in the future, to provide references to future potential investors too. 

You could put in a mini split hvac unit.  

Cleo (RIP).Show me a screen shot of your hearty short position on SPY, or better yet long-term shorts on e-mini or SnP futures and I'll know you have the courage of conviction :) I'm with @Jay Hinrichs and @Bob B.

A mini split will use less gas than a furnace will, even if your power plant is gas fired.

We added a mini-split to give the area adequate HVAC and added around $10k in value to the home.

One thing i worry about is that in my tenants kitchen is a brick facade. it seems like there's a mini crawl space behind the facade and the actual sheet rock.the cabinets and sink and everything else is in front of the facade. 

Would mini-splits be a better option?

You need to patch the stucco anyways it's all cracked from water intrusion.I would rent a mini backhoe AFTER I checked with gas and water to see where the lines are.Used creosote ties will cost you $90 for this project, plus the pins, an inch of gravel, a drain line, the rental $390 for a day, heavy lifting and some hand digging. $1000 and three back breaking days.

@Greg Soon - SLC has loosened up their ADU requirements to combat the mini-housing crisis they are seeing here.The code is outlined in the section below.Section 13.11.010

If its in the middle of nowhere , the campground has to be the attraction , this takes big money , you have to supply the entertainment .Like pool , game room , mini golf , bands on the weekend , kids games etc.