Hi there krgambling
Honestly airconditioning is a comfort thing, i'm sure from a renters point of view, that a house with airconditioning and a house with out airconditioning, that they would go for the a/c one and would more then happy spend extra $$
In regards to split systems themselves, i would just pay the price and get one installed and not go halves with the tenant. Split systems only get 4-5years out of them in before they start playing up, pc boards failing, and gas leak after gas leak start forming and at the end of the day there will be a fight over landlord/tenant to who will pay for that bill if it is joint owned. Splits systems aren't worth removing once they have age on them. I do these kind of jobs at work weekly and the price of pumping down the system to take to another property would be close to the price for a fresh install and still have money left over towards a new better split system that will be trouble free for another 4-5years
Just my 2cents
Cheers Nick
