I say the first unit is a deal breaker.

Right now there's a sub-panel being fed by a 50amp breaker. 

You can connect 2 of the blower units on one 240v feed with sep thermostats (using the correct breaker & wire gauge sizing). 

Install outlet for refrigerator.3.Replace all receptacle outlets and switches.4.Furnish/Install outlet for refrigerator.5.Furnish/Install GFI receptacle in exterior rear yard only.6.Furnish/Install six recess lights in kitchen, install 12 recess lights in basement.7.Install 20amp circuit for microwave.8.Furnish/Install customer’s chandelier.9.Furnish/Install three smoke/CO2 detectors one on each level.10.Furnish/Install GFI in basement bath and second floor bath 11.

I rented to them instead of a single male professional with a $60k/year job and sterling credit.Yes, I'm taking on more risk of damage (and having three people has meant I had to deal with overloaded circuits I never had to before), but personally I feel it aligns my gifts with what others need.

Well here is my lesson learned.When you are buying a house that has a pressure factor associated with it, like size for example, be on the lookout for deal breakers.  

Originally posted by @Moumini Foumdjimba:The best people to ask is Dareen Weeks of Fast Track Cash Flow or Dustin Hahn of Dustin hahn International both are real estate investors from Alberta Canada They are also both on the talking heads circuit, so approach with caution. 

My guess is that besides the complexity and unrecoverable cost of underpinning, that as Brian mentioned, egress, may be the deal breaker.

What about your arc fault breakers for living rooms and bedrooms?  

This guy, after being in the podcast circuit especially, should know people would see that coming a mile away.