[ShakataGaNai]

No, you're just forcing your expensive AC to run longer and run less efficiently. On the flip side, if you get a unit that's too big it'll cycle on and off too frequently - shortening the lifespan. You should get a correct sized unit for your house and space. The AC unit will last longer and use the least amount of energy.

If you live somewhere that humidity is an issue - in some places that's in the winter (when you wouldn't use cooling AC) - get a whole house dehumidifier system. Ex: https://www.sylvane.com/whole-house-dehumidifiers.html -- Those will run and maintain the correct humidity regardless of AC.

Use the right tool for the right and you'll get the most efficient results.