We have a sizing and brand recommendation chart available on our A/C Selection pages for Window Units and Mini Splits. Several factors go into choosing the right size A/C, including ambient temperatures, the ground temperature where you live, if you are storing anything which produces heat, and if the cooler is indoors or out in the sunshine. The most important factor is your insulation.
Our favorite brand is LG – we have the most experience and best results working with their window units. We do not carry A/C units directly, but you can purchase them through our Amazon Associate links here:
If your cooler has custom details, maybe your size does not match the charts, or you anticipate frequent door openings, please fill out our Cooler Construction Help Form and we would be happy to accurately size the a/c for your cooler.