Split Air Conditioning Units

With the warm weather approaching im trying to stay cool this summer. Any have a hook up on split air conditioning units? I used to do HVAC but no longer have the contacts I once had. I have roughly 500 sqft im looking to cool.

Ive looked into the portable units but having a house full of casement windows doesnt help me with the vents thats required for them.

Any input is greatly appreciated.