Heating Supply Requirements - Landlord

[James Leos]

Hello All,

I'm refinancing a fourplex in Phoenix and am having a little hang up with the appraisal.

The property is all wall AC units, tenants use space heaters to supplement when needed during the winter.

The appraisal is subject to installing heating sources.  I've had a couple people look at it and it seems the only fix would be to install central ac systems, installing heating base boards won't work at this property.

My question is, is it required by law for the landlord to provide a heating source in Phoenix/Maricopa County?  I see properties with only wall ACs selling all the time.  Anybody with wall AC units what are you doing about heat?

Thank you,

James