Then she and I renovate the house and sell in march-April next year when the school district buyers heat up? 

I have used and am happy with Mickle Electric and Heating.

It's a dry heat here. :)

Heat?

You may want to convert to gas for heating the 2nd floor and upgrade the electric to accommodate baseboard heat on the first floor since I'm assuming you'll hold this property long term so you'll want to make heat the tenants responsibility.

Dogs and cats pee on laminate, hot-water humidifiers leak on it, kids start wet-mopping it when they spill something on it that they don't want Mommy to see, tenants turn off the heat when they go somewhere no matter what you write into the lease, and the stuff swells at the joints.

All separate heating systems installed in 2014.  

I also do not have a thermostat to my heat in the unit which leaves me no control over that.

Converted everything to electric heat and metered it out to the tenants.

Also, does any owners of units simply go through and replace the anode, thermostat, and heating elements for less then $100 in materials and find that has proven to be a solution to get the units to last another 7 to 8 years?