You can invest several syndication's as David suggests and expect between 15-20% IRR or buy them on your own. 

I'd specifically explain that the HVAC is the only allowed heat source, no other appliances are permitted,  and if it's not powerful enough, suggest you guys part ways.     

Any suggestions would be greatly appreciated!

I'd suggest seeing if there are any BP Meet Ups in your area. 

I suggest only paying once the job is complete.

I may ask our tenant in unit B to do this as he works from home and would likely be willing to let people in as needed.Also, other posters’ suggestion to do open houses on Saturday and Sunday is a good one.

Legally, must I return any garnishment checks I might receive...and how in the world would I know when her bankruptcy case would be complete, in order to wait to garnish her wages, later, as he suggested?

If not, outside of BiggerPockets, I would suggest that be the first place to start to surround yourself with like-minded individuals in the Real Estate business.Along with BP, DIG has definitely played a big role in my Real Estate investing career through networking and education. 1st meeting is free.

I would suggest you keep doing what you are doing. 

My question is: my offer was subject to an inspection and the sellers agent suggested I do one ASAP but I don’t want to pay for an inspection of the bank hasn’t accepted my offer yet.