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What is the energy consumption of a wall-mounted air conditioner?

Unraveling the Energy Consumption of Wall-Mounted Air Conditioners


As a trusted HVAC company in Montreal, AirGreen understands that making informed decisions about your home or office's air conditioning needs is vital. One of the most frequently asked questions we receive is about the energy consumption of wall-mounted air conditioners. This article seeks to clarify this critical aspect, providing you with comprehensive, easy-to-understand insights.

Energy Consumption: The Basics

Wall-mounted air conditioners, often called split air conditioning systems, are a popular choice for individuals seeking efficient cooling solutions. A key factor that influences this efficiency is the unit's energy consumption, which varies according to several parameters including:

  • The unit's cooling capacity, typically measured in British Thermal Units (BTUs).
  • The Energy Efficiency Ratio (EER) or Seasonal Energy Efficiency Ratio (SEER), which signifies the cooling output per unit of power consumed.
  • The frequency of use and your preferred temperature settings.
  • The external environment, including room insulation, size, and the outdoor climate.

How Energy Consumption is Calculated

The energy consumption of an air conditioner is typically measured in kilowatt-hours (kWh). You can determine this by multiplying the air conditioner’s wattage by the number of hours it is in use, then dividing by 1,000. Keep in mind that this is a simplified calculation and the actual energy consumption might be influenced by other factors like temperature settings, maintenance frequency, and insulation quality.

The BTU Factor and SEER Rating

The BTU rating signifies the amount of heat that the air conditioner can remove from a space per hour. A higher BTU rating means that the unit has a greater cooling capacity. It's important to choose a model with the right BTU for your space to ensure efficient energy use.

SEER, on the other hand, gives an average calculation of the cooling output divided by the total electric energy input, measured over a typical cooling season. A higher SEER rating implies greater energy efficiency. Today’s models are required to have a SEER rating of at least 13, but more energy-efficient models can reach up to 25 SEER.

The Role of Inverter Technology

Inverter technology has revolutionized energy efficiency in air conditioning. Traditional AC units work at a constant speed, turning on and off to maintain the desired temperature. In contrast, inverter air conditioners adjust their speed according to the cooling demand, consuming less energy. Thus, choosing a wall-mounted AC with inverter technology can help reduce your energy consumption significantly.

Importance of Regular Maintenance

Proper and regular maintenance can also affect your wall-mounted AC’s energy consumption. Regular check-ups and cleaning can prevent issues such as refrigerant leaks or clogged filters that could lead to decreased efficiency and increased energy use.

Optimal Usage Tips

To maximize the energy efficiency of your wall-mounted AC:

  • Use energy-saving modes and features, if available.
  • Set the thermostat at an optimal temperature of around 24-26 degrees Celsius during summer.
  • Use a timer function to manage your AC’s operation when needed.
  • Maintain proper insulation in your space to prevent heat infiltration.


The energy consumption of wall-mounted air conditioners is a complex subject, influenced by factors like BTU rating, SEER rating, technology, usage habits, and maintenance practices. By understanding these factors, you can make informed decisions about your cooling needs. At AirGreen, we are committed to providing you with energy-efficient HVAC solutions that match your specific needs. We are ready to assist you with any queries regarding your air conditioning unit's energy consumption and efficiency.