Here are 4 models with small window air conditioner dimensions for you to consider. They are all highly rated. Larger options from 8000 to 12000 BTU are listed in the next section including the very unique and efficient Midea U window AC in various sizes. These 5000 and 6000 BTU window ACs...
1. Honeywell MO08CESWK Compact Portable Air Conditioner Specs Power/cooling capacity (Ashrae – 128 standard): 8000 / 10000 BTU Recommended room size: Up to 250 to 450 sq. ft. Weight: 43 lbs Dimensions: 13.5” x 14.6” x 27.7”