Installing AC Window Units for a Tenant

[Sean Barrett]

With the weather getting warmer out, I'm wondering if anyone else has come across issues with having to install AC window units in their rental properties?  

There might be a little frustration on my part...

Back story:  I have an upper unit of a duplex in Bayview Milwaukee without central air and with a nice older lady leasing it.  She was an inherited tenant been there 15 years that is getting an extreme steal on the space (rent will be going up soon to get closer to market, reason hasn't already, is purchasing another duplex and wanted to limit vacancies.)  I kindly agreed to take out the ac units during the winter months due to windows being drafty and kindly agreed to reinstall the units again, however with this older Bayview home the windows are swing open making it very challenging to install the last unit.  I'm wondering whose responsibility is it to do these installs? if all the ac units are hers and I'm struggling to get the final large unit installed?  Am I being too nice doing this for her since they are her units, or is it my responsibility to do so?  

This might sound a little complainy pants, but for the deal she is getting it becomes frustrating for these little projects.  I'm thinking of getting central air installed in the next year or 2, which will most likely price her out of the unit.  Any thoughts on this matter?  Sorry for the little ranting.