Selecting the proper amount of BTU output for your space is crucial in order to ensure an air conditioner's peak performance potential is met. Too powerful a unit won't dehumidify properly and an underpowered unit will struggle to perform its job. Most units will tell you outright how much square footage they can handle, but these usually round up a 1,000 - 2,000 BTUs in the interest of ensuring profits and making sure a company brand isn't embarrassed by seeming 'underpowered.' A lot of people ask outright "What size air conditioner do I need?" Indeed, there are a lot of things to consider here, which are detailed in Part 2 of this series.

Energy Star Rating - AC units must be at least 10% more energy efficient than the minimum federal government standards to qualify for this certification. While at smaller cooling capacities (5,000 to 6,000 BTUs), this doesn't really make a huge impact in the upfront premium paid vs the ongoing operating costs, it does save you money at larger cooling capacities.
 

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