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comfort-aire 12000 BTU window air conditioner with electric heat

Comfort-Aire 12000 BTU Window Air Conditioner with Electric Heat (REG-123L)

Model: REG-123L | SKU: co2600
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  • Product Overview

    The Comfort-Aire REG-123L Window Air Conditioner with Electric Heat uses 12,000 BTUs of cooling power and 11,000 BTUs of heating power to keep spaces up to 500 square feet comfortable all year. In addition to Cool, Heat, Dry, and Fan modes, this model offers Auto and Energy Saver features. It offers an energy-efficiency ratio (EER) of 9.8 and convenient features such as an auto-restart function, adjustable air direction, and washable air filter.

    Versatile Room Comfort

    The Comfort-Aire REG-123L is equipped with several individual operating modes that ensure comfortable room temperatures all year.

    • Cool: Using 12,000 BTUs of cooling power and 3 fan speeds, this Comfort-Aire AC efficiently cools areas up to 500 square feet. Its operating temperature range is between 62 and 89 degrees Fahrenheit in Cool mode.
    • Heat: This model offers 11,000 BTUs of heating power and is designed for supplemental heating.
    • Dry: In Dry mode, this AC eliminates humidity as it cools your room by extracting 86.4 pints of moisture per day.
    • Fan: Use fan-only operation to prevent room stuffiness in cooler temperatures. This model is equipped with high, medium, and low speed settings as well as an auto fan function that automatically selects a speed based on room temperature.

    Energy-Saving Features

    This Comfort-Aire model offers features and modes that reduce cost and energy consumption. Its Energy Saver mode maintains a reasonable room temperature while you’re at work or out of town because it automatically stops the fan and compressor when your optimal temperature is reached.  The Auto feature works in Heating and Cooling modes and automatically selects heating, cooling, or fan-only operation based on the room’s ambient temperature. A delayed timer lets you automatically turn on or off the unit 30 minutes to 24 hours in advance, so your Comfort-Aire window AC won’t run unless it’s needed.    

    Window Kit Included

    The Comfort-Aire 12,000 BTU Window Air Conditioner with Electric Heat is equipped with all the tools you need for secure window installation. Its installation kit includes a top-mounting rail, vertical sash seal, accordion panels, and support brackets. It can be mounted in windows between 27 to 39 inches wide or through an outside wall.

    This is a 230-volt AC that uses a NEMA 6-20P plug type. The 3-prong face looks like this:

    Additional Features

    • Sleep Mode Feature: This mode reduces energy consumption by slightly increasing the temperature in Cool mode (or decreasing it in Heat mode) while you sleep before returning to the set temperature after 6 hours. 
    • Washable Air Filter: The reusable air filter saves you money and ensures efficiency.
    • Check Filter Indicator: Located on the unit and remote control, this feature reminds you to clean the air filter to maintain maximum efficiency.
    • 24-Hour Timer: Using this feature, you can program the window AC to start up or power down in 30-minute intervals for up to 24 hours.
    • Adjustable Airflow: Two-way adjustable front louver lets you direct the airflow horizontally and vertically, providing uniform cooling and enhanced comfort.
    • Digital Remote Control: Conveniently change modes, fan speeds, and other settings with this full-function remote control.
    • Eco-Friendly: Its R-410A refrigerant does not contribute to ozone depletion.
    • Auto Restart: In the event of a power failure, it will automatically restart and resume operation in the last programmed settings once power is restored.
    • Digital Display: The digital display screen shows the current room temperature and the remaining operation time when the timer is set.


    The Comfort-Aire REG-123L is a powerful and efficient window AC perfect for cooling, heating, or dehumidifying spaces as large as 500 square feet.

    What Customers Love

    • Maximum Room Comfort: This model keeps your home comfortable by cooling, heating, dehumidifying, or acting only as a fan and also offers Energy Saver and Auto features.
    • Energy-Efficient Features: The full-function remote control lets you easily program the timer, change modes, or modify fan speeds to maximize energy efficiency.  

    Things To Consider

    • Not Energy Star Rated: Many users prefer to buy Energy Star rated units, and while this is an efficient window AC with a 9.8 EER and includes many efficiency-boosting features, it’s not Energy Star rated. 

    Manufacturer's Warranty

    1 Year Limited (parts and labor) & 5 Year Limited (sealed system)

    Manufacturer's Literature

    Owner's Manual
    User guide for the Comfort-Aire REG-123H 12000 BTU Window Air Conditioner
    Energy Guide Label
    Includes information about the estimated yearly operating cost for the Comfort-Aire REG-123H Window AC.

    What's In The Box?

    • Comfort-Aire Window Air Conditioner
    • Window Kit
    • Owner’s Manual

    View All Window Air Conditioners »
  • Specifications

    Window Installation TypeSingle/Double Hung
    Cooling Power12000 BTUs
    Recommended Coverage Area500 sq. ft.
    Chassis TypeSlide-Out
    Height15.563 in.
    Width23.063 in.
    Depth23.438 in.
    Weight93 lbs.
    Minimum Window Width23.063 in
    Maximum Window Width36 in
    Programmable TimerYes
    Refrigerant TypeR-410A
    Voltage220-240 V
    Maximum Cooling Amperage5.5 Amps
    Maximum Heating Amperage15 Amps
    Number of Fan Speeds3
    Fan-Only ModeYes
    Heat Mode Yes
    Heater TypeElectric Coil
    Heating BTUs11000 BTUs
    Dehumidifier ModeYes
    Moisture Removal per Hour3.6 pints
    Sleep ModeYes
    Remote ControlYes
    Airflow Direction ControlYes
    Air FilterYes
    Maximum Cubic Feet per Minute (CFM)267 CFM
    Minimum Noise Level53 dB
    Maximum Noise Level58 dB
    Wall Sleeve Included No
    Thru-Wall Installation OptionNo
    Check Filter IndicatorYes
    Intrusion ProtectionNo
    Insect BarrierNo
    Plug Face Type6-20P
    Energy Efficiency Ratio (EER)9.8
    Energy StarNo
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