Portability vs Installed Air Con
If you are renting, then a portable air conditioner may be a much better option, since it eliminates the need for potentially intrusive and expensive installation. While it may not deliver the same output as a split system, it is hassle-free to setup, and easy to take with you when you move.
Single Phase vs 3 Phase AC's
Three phase air conditioners are more reliable and efficient than single phase units, for this reason they are the preferred option for industrial or commercial installations. Three phase air cons draw up to 40% less current and can still deliver the same output as a single phase, however, residential power supplies are predominantly single phase. Choose the model that is suitable for your space.
Reverse Cycle vs Cooling Only
The reverse cycle system allows you to heat or cool the environment. If you live in a place where temperatures fluctuate regularly, or would like to heat in winter, a reverse cycle air conditioner would be the most logical choice. If you only require cooling during the hotter summer months then a cooling-only air conditioner would save you a few extra dollars.
AC Running Costs
Some air conditioners use more power hungry than others, even when cooling an identical space. Look for the ones with a high star rating, you may spend a little more upfront, but the savings of running an efficient unit will quickly repay that cost.
Extra features provide additional comforts. Economy Mode lets the unit dynamically adjusts the power output to only what is required, Turbo Mode temporarily boosts output to quickly cool down a hot room, even a Remote Control is an optional extra for lots of models. Look for models that provide you with extra features, although some may seem gimmicky, others will provide added benefit to you.