Assuming you're burning gas, one thing you could easily do to supplement the heat in the basement is run hot water baseboard from the domestic HW heater.

If they will stay fine, if they intend to leave give them 2 months notice to increase rent allowing them to find a place and for you to screen new applicants at the new rental rate.This will allow for a smooth transition without a vacancy and gets rid of inherited tenants allowing you to bring in tenants to your standards to properly educate.Giving smaller increases over a longer time period will end up in the same position, at some point with the inherited tenant leaving, and only places the landlord in a position of having to supplement their rent till they do leave. 

So, to get $4K/mo off $250K is a bit of a stretch but many of these sponsors offer refinancing or supplemental loan opportunities to return equity back to investors in a shorter time horizon like 2-3 years which could increase CoC and IRR numbers that can get you in the ballpark you desire.Once you identify a niche or two you like, vet the sponsors.  

That being said bills are already in place to supplement more insurance companies and options.

I'm looking for insurance options in Las Vegas.Any AirBnB landlords have experience getting supplemental insurance for rooms or guest houses they are renting off of their primary residence?

You have to do the roof on that house and it costs $7,000, well you had the cash on hand and you don't need the cash flow to live so you just don't make any money for 1.5 years as you replenish your fund.The issue is a lot of people spend all that cash flow and don't have the liquid reserves or supplemental income to handle a prolonged vacancy or major capital repair, so they should be accounting for this and putting away money for the inevitable. 

To think that I started on this quest merely to supplement what I currently have and to put to work whatever  modest amount of "excess" I have from my current job.

Wake up at 5am (glad to see I'm not the only one)Shower, dress and slug down a glass of water along with vitamins and supplements. 

Most people who are trying to become wholesalers are trying to make a job out of it and want/need consistent income so they can supplement (or even replace) their W2 income. 

That seems like the perfect amount for me to supplement my 401k when I eventually retire, so I’ll probably call it good.