@Mark Ross  don't include heat in rent on an ongoing basis. 

Many properties will need specialized attention, especially with plumbing, electrical, and historical elements. 

The handyman then quoted me $3500 for heat treatment for the bedbugs. 

The first house that I bought was 17 years old, 3 br, 1.5 bath, brick ranch house with hardwood floors, Andersen windows, ceramic tile baths, gas heat and a brand new roof. 

hi all i am a new landlord and got my first rental property. tenants moved in in September and October. the first month was fine but when December hit it got extremely cold and the heating is electric. due to poor insulation in the home that we did not know about the heat has to be turned very high up to keep the home warm, however since everything is electric it is causing the electric bill to be $800. the utilities are the tenants responsibility. however because of this one of the tenants has been extremely non compliant with paying rent.

Without electric you can not heat the unit.

Is it worth it to put in central heat and air?

Here’s what CCC looks like when applied to large multifamily properties:Key Elements of CCC1.

So, anyone who tells you to worry about the heat in AZ doesn't get it. 

Do you have central boiler for water and heat or individual units?