what it sounds like you are asking is illegal in many ways, section 8 laws, local laws, duel contract laws that conflict, there always has been also those out there looking to catch you breaking them,  avoid it, dont offer it, dont entertain it, there is leeway up if the tenant meets certain conditions, say need 1 floor rental, if not rent may be inflated over realistic market, which is what rented at not listed at, keeping in mind sec 8 market rents also include utilities paid, you can usually reach by email fastest, they have set chart, heat type, neighborhood etc, more than listings found online

But all well maintained with central heat and air.  5 of the 7 were vacant.

Yea I think ill need to get a plumber over, Someone is suggesting that it is a heat tracer.

I am wondering since no one has asked , is the unit a heat pump or a Air conditioner . 

Electric stove, dryers, water heaters, and high-efficiency Mitsubishi heat pumps.

Chicago winters can be harsh, so we're curious if anyone has had a good experience using a heat pump with an ancillary heat strip for those extremely cold days when the heat pump can't keep up.

We face similar heat waves here in College Station, TX.

You also have to deal with winter weather in the northern states and possibility of pipes freezing and higher heat costs (which would be paid by the tenant once rented out).

Just make sure you set enough aside for capex, vacancies, unexpected insurance increase, taxes, tax professionals, and local considerations (excessive heat? 

I have seen properties convert the radiant heat system to electric board heating style during remodels.