should I add a new air con split system

I bought an IP around 13 yrs ago and the air con system was old. I thought back then that it should be replaced.

I have new tenants in the house and paying top level rent. They havent asked for a new air con system but cant decide if I should pay for one or not.

I recently refinaced my loan and have additional funds. A new split system can be depreciated.

I usually put the rent up each year by $10 a week increase minimum.

The tenants have a gas heater in the lounge room already. I wonder if they will even use an air con in the summer.

The prices could be around 1500 to 2k for a split sys plus installation 750.

I have other plans to remove and replace an old garage and maybe install an ensuite.

What do you think?

should I add a new air con split system