How to avoid A/C emergency issues

[Luke H.]

Hi,
I live in Texas and it gets HOT here... I have yearly maintenance done on all A/C units to ensure they are working properly.  When an A/C unit stops working tenants will make this an urgent emergency.  My A/C guy is very good about getting to the property and getting it fixed.

I wanted to come up with ideas to help avoid this problem and ideas for what to do if the A/C guy can't get there on the first day?  I understand tenants concerns and want to figure out a win/win situation here.

I was considering buying 1 A/C window unit or indoor door A/C unit for each property as a backup for emergencies.  

What do you guys do, and any ideas would be great.

Thanks