Which is preferred: an undersized air conditioner or an oversized one?

The preferred choice in this scenario is typically an undersized air conditioner. An oversized air conditioner can lead to several issues that hinder its effectiveness and efficiency. When an air conditioner is oversized, it cools the space too rapidly without running long enough to effectively remove humidity. This can result in a clammy feeling indoors, making the environment uncomfortable.

Additionally, excessively large units cycle on and off frequently, leading to higher energy consumption and increased wear on components, ultimately shortening the lifespan of the unit. An undersized air conditioner, while it might struggle on particularly hot days, often operates for longer periods, which helps to dehumidify the air and maintain a more consistent temperature.

With this understanding, it's clear that choosing an undersized unit is generally more effective in providing comfort and energy efficiency in most situations compared to selecting an oversized system.