This is often considered the most significant factor when purchasing a portable air conditioner. These units have a smaller size than an average smartphone. Not anything to be excited about, but not something to be worried about either. Portable air conditioners or mobile air conditioners are easy to use and can be moved around the house. They are usually much lighter than traditional window units and can be easily moved around or transported if needed. Portable air conditioners rely on interior air, unlike window air conditioning units that use external air to cool the coils. The size of the portable air conditioner you need depends on the size of the room you want to cool. If you need to cool multiple rooms on various levels, buying two units would be a good option. Dual-hose portable ACs are more efficient than single-hose units because they have an extra hose. Mini-splits without ductwork are more efficient than other ACs. The higher BTU rating indicates that your unit will need more power and be less efficient than window air conditioners. You can use one of these until your AC is repaired. Split system air conditioners need to be permanently installed on the wall. It has survived five centuries and the leap into electronic typing, remaining essentially unchanged.