Need Portable A/C advice

[jambo101]

Just starting to research portable A/C units as our window unit is not safe enough according to the wife as burglars could break in via the air conditioner.
I'm wondering about the window attachment for these type of units and how easy it is to close the window every night
I'll probably end up with something like this
Portable water-to-air 13,000-BTU air conditioner
but i have no idea what water to air means,does it need to be hooked up to a water hose??.
The unit is just meant for living room and kitchen, an area approximately 18'X18'
Thanks for any info.