Adequate a/c unit for garage apt
I'm converting an 80 year old detached garage into an efficiency apt. it's approximately 400 sq. ft. 11 ft. ceiling. It will be basically one big room plus bathroom. This is in South Florida with high humidity and I have been told that an over capacity a/c unit may not cycle often enough to remove the moisture in the air. The location of the unit will be wall mounted at a centerline height of 8'. I ran two separate cables to this spot so I can utilize either 110V 20AMP or 220 30 AMP .What would you recommend as to: BTU capacity, 110 vs. 220, or other factors I should consider? Thank you