What Do I Need to Know Before Buying an Air Conditioning System?

Get the Sizing Right First

Central air conditioners are offered in 6,000 Btu increments, which equals one half ton per step. Proper sizing is critical for both performance and humidity control. An undersized system runs longer than it should and never quite catches up, which lowers your comfort on hot days.

An oversized system is the more common problem. It short cycles, turning on and off too frequently. Those short run times do not allow the unit to pull humidity out of the air, they raise energy use through repeated startup spikes, and they shorten the life of the equipment. The right size depends on your home, so have a local licensed contractor run a load calculation before you choose.

Compare SEER2 Ratings

SEER2 is the current efficiency rating that took effect in 2023, and it measures how efficiently a system cools over a season. A higher SEER2 rating generally means lower operating cost, though the savings are not a fixed amount per point because the relationship is not linear. When you compare two systems, the higher SEER2 unit usually costs less to run year after year, so weigh that against the model and budget you choose.

Consider a Variable Speed Blower

If you live in a humid climate, look at a variable speed indoor blower. This feature increases humidity removal and reduces operating sound levels noticeably, since the blower can run at a low, steady speed instead of switching fully on and off. The result is more even temperatures and a quieter system.

Putting It Together

Match the size to your space, pick the SEER2 level that fits your climate and budget, and add a variable speed blower if humidity is a concern. AC Direct ships complete systems backed by the AC Direct Price Promise, and a local licensed contractor handles sizing and installation.