Different areas, different tenant base, different local minutiae, and different contractors, handymen, electricians, and more.

Agent: Kent Hranicka with the Duplex DoctorsLender: Conor Hesch with Bell BankTitle: Sarah Weaver with Chicago TitleContractors: Would not recommend my handyman and I DIYed a fair amount, but I do have an electrician for small jobs and also Dennis with Arrow Pest Control was very knowledgeable/helpful for this situation. 

Its very difficult finding anyone that can do any kind of home maintenance , plumbers, electricians, contractors, etc...

Electrician 

Hi Sarah, I have split the rent with tenants, and you are right it's not easy, however adding an additional fee to the rent to include the cost of heat or possibly installing electric baseboard heat in the units (contact an electrician to confirm the price of upgrading panels and installing) may be an option. 

That's why I used a licensed electrician to put in the line and a licensed plumber to install the new electric water heater.

The units are all electric, electrician ran 8-3 wiring from the box to get power to the units.

They don't triage service calls and need an electrician to swap a fixture, wall heater or bath exhaust fan.

I was trying to do a fire alarm system like I had in the 4plex I recently sold to buy these properties, but the electrician said we wouldn't be able to pull the permits considering the cards at the Building Department had it as a 3 family. 

Kool comments about an electrician, I saw that in another reply so I assume that is correct and the comment of Good Connections was an intentional pun.