Frigidaire 12,000 BTU Built-In Room Air Conditioner with Supplemental Heat- 230V/60Hz Effortless™ Remote Temperature Control A thermostat located on your air conditioner's remote control precisely maintains preset room temperature, so you will remain comfortable at all times. Effortless™ Temperature Control Our air conditioners maintain the preset room temperature, so you will remain comfortable at all times. Energy Saver Mode Energy Saver Mode can help reduce your utility bills, while still keeping guests cool, by maximizing energy efficiency. In this mode, the unit doesn't run at all times, it turns on and off at different intervals to ensure that the room temperature stays at the set temperature.