The answer to 'best air conditioner' is that there is no single 'best' air conditioner that works for every home. The best air conditioner for your home depends on factors like the size of your home, your climate, energy efficiency needs, and your budget. In general, high-efficiency central air conditioning systems or ductless mini-split systems are often considered among the best options for most homes.
Central air conditioners provide whole-home cooling and are a good choice for larger homes. Look for models with a high SEER (Seasonal Energy Efficiency Ratio) rating, which indicates better energy efficiency. Ductless mini-splits are a great option for homes without existing ductwork, as they allow you to cool individual rooms or zones. These are also highly efficient and can provide heating as well as cooling.