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

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

Or would it be more cost-effective to replace just SEER condenser and evaporator coil for the AC?

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.

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Quote from @Sara Emmanuelle Dube: Hey John, Sent you a DM - Contact me please I have questions.Thanks@Drew Sygit I love seeing you getting some heat on here also so it’s not just me that gets everyone’s panties in a tangle haha.

I live in anaheim California, when it's hot out, my upstairs apartment seems to trap all the heat inside since the ceiling is wood beams, it gets so bad that even if I open up all the windows and doors, no air flows through here.