Cheap central air conditioning units are available but the money saved by opting for a lesser known brand can cost you in wasted energy over a number of years. When choosing a unit, you should first look for one with a high SEER efficiency rating. Older models can have a rating of just 5 while newer units can score in the twenties and above. Choosing a system that has Department of Energy approval via an Energy Star certification is the best place to start. All units are rated by their seasonal energy efficiency ratio so select the best according to your budget and requirements.
Comfort is also a major factor you should consider. A quiet system is preferable; as it will not annoy the neighbors, so try to opt for a unit with well-designed fan blades and variable settings for power and noise. Most of the best units on the market have a sound rating of lower than 60 decibels. Design is important due to landscape and space concerns. Ideally, the unit should be reasonably compact and be easy to maintain through easily accessible coils, filters and other components.
Selecting an HVAC system from a reputable company is also beneficial as you will receive higher customer service levels. You want to able to able to contact the manufacturer across multiple platforms and get clear, free and helpful information online.