Department of Energy Department of Energy Energy.gov room air conditioners room air conditioners energy efficiency ratio typically calculated room air conditioners Window air conditioner energy saving tips] US Department of Energy energy efficiency of air conditioners energy efficiency rating Department of Energy energy efficiency of air conditioners energy efficiency ratio energy efficiency ratio energy efficiency of air conditioners Department of Energy They can fit in both small and large rooms room air conditioner energy efficiency of air conditioners room air conditioner Energy Efficiency Ratio energy efficiency of air conditioners https://energy.gov/energysaver/room-air-conditioners Window air conditioner energy saving tips] Department of Energy energy efficiency ratio