Awww poor Lily and Luna and poor you also Kirsten.
What I use to do before I had an A/C was wet a cloth with cold water and wipe the cats paws and the top of their heads with it.

As for you Kirsten, take a hand towel, wet it with cold water, wring it out and wrap it around the back of your neck and sit with your feet in a bucket of cool water. Hope these little ideas help you out.

Headbumpies and kisses to you Lily & Luna.