Don't laugh!
We sail in New Jersey, our HOT season is not as long ,usually, as some of you further South. SOOO,I made a small wooen platform, for thecockpit floor that folds to 4" thick and15" long, custom made a set of two hatch boards, set a 5000BTU home window unit on the platform, (with all the hardware removed)thru the custom hatch board, with a hole to match the A/C unit, and plugged her in! To go below, you remove the top board, step over the A/C unit onto the step, and go in or out with ease.When sailing, I set the unit on the sole in front of the chart table, it does not move on the carpet, and there is room to walk by.