"Ductless air conditioners have become a preferred choice by many in the recent times. It is mainly due to the flexibility associated with these kinds of units. However, in spite of the many advantages of a ductless unit, it is recommended that certain factors are kept in mind while buying a ductless air conditioner.They are the following:You need to decide whether you need a single-zone ductless split air conditioner or a multi-zone unit. If you are looking at cooling more than room it is necessary that you opt for a multi-zone unit. However, keep in mind that a multi-zone unit is more expensive than a single-zone unit.BTU is also a factor that needs to be given attention to. BTU or the British thermal unit is typically the power of the air conditioner. Thus, higher the BTU of a unit more is its cooling capacity. Hence, if you are looking at cooling a larger space it is a better idea to opt for a ductless air conditioner with a higher BTU.Energy efficiency of an air conditioner is also something that you cannot afford to miss. It is generally measured with Seasonal Energy Efficiency Ratio or SEER and it is always a good idea to buy a unit with a high SEER rating because that means the cooling unit is more efficient and it will not incur unnecessary energy loss.Lastly, you should also check the compressor type. Generally, there are two types of compressor the rotary and the inverter. Most people opt for the inverter compressor because they use only that much power which is required to reach the desired temperature and the result is savings of energy. On the other hand, rotary compressor turns on and off a number of times to reach the desired temperature which leads to energy wastage."