Air Conditioning Cooling Area Calculator

Air Conditioner Capacity Calculator, Cooling Capacity (W] Calculation Guide by Area

We calculate the most suitable air conditioner capacity by considering the area, purpose, and insulation environment of the space. From residential use to hot restaurants and server rooms, verify the precise cooling capacity (W] tailored to the characteristics of your space to select the optimal product that saves on electricity bills and maximizes cooling efficiency.

Air conditioner capacity calculation formula

Cooling capacity is calculated based on 'heat load' rather than simple area.

Calculate Required Cooling Capacity (W]
Required Cooling Capacity (W] = Construction Area (㎡] × Standard Load per Space (W/㎡] × Environmental Factor

Here, an environmental factor of 1.0 to 1.3 times is applied depending on the window area, sunlight, and insulation condition.

Air conditioner area conversion
Air conditioner area = Cooling capacity (W] ÷ 400 (Residential standard]

Typically, a cooling capacity of 400W is calculated per pyeong, and since commercial use involves high loads, a larger capacity is required.


Detailed Guide to Calculator Input Items

Please check the items below for accurate capacity design.

1. Selection of space usage

The standard load varies depending on the nature of the space, such as homes, offices, and restaurants. Higher output is required in areas with many people or cooking equipment.

2. Input construction area

Enter the actual area requiring cooling. If the living room and kitchen are connected, the areas of both spaces must be combined for the calculation.

3. Installation Environment Settings

South-facing living rooms with strong sunlight, top floors, and commercial spaces with a lot of glass experience significant cooling loss, so please set the environmental factor high.


Cooling Load Standards by Space Use

Space usage Standard cooling load Drainage relative to area Key Features
General residential space 350 ~ 400W 1.3 ship Living room and room in a typical apartment, villa, or detached house
Office / Commercial Facilities 450 ~ 550W 1.5 ~ 2 ship A space with a large number of people, computers, and office equipment
Restaurant / Cafe 600 ~ 700W 2 more than double Commercial space with high cooking heat and foot traffic
Server room / Computer room 800 ~ 1200W 3 more than double High-density heat source space where equipment heat is generated 24 hours a day

Expert Practical Know-how & Checklist

These are the practical points you must check before installing an air conditioner.

  • Make sure the cooling capacity is ample.

    Choosing a capacity that is about 10 to 20% larger than the exact capacity is a way to reach the desired temperature faster and increase inverter efficiency, thereby saving on electricity bills.

  • Outdoor unit installation environment

    Cooling performance drops sharply if there are obstacles around the outdoor unit or if ventilation is poor. Install it in a well-ventilated area and be sure to open the heat exhaust louvers.

  • Using a circulator

    Using a circulator with an air conditioner allows you to circulate cold air further, enabling faster and more even cooling of large spaces.


Frequently Asked Questions (FAQ]

  • Q. Is it good to keep the inverter air conditioner on all the time?
  • A. Yes, since inverter models operate at minimum power after reaching the set temperature, leaving them on for a certain period of time consumes much less power than turning them on and off frequently.
  • Q. Which is more accurate for cooling output, W or square footage?
  • A. Since standards for area may vary by manufacturer, checking the rated cooling capacity (W] is the most accurate method. Typically, 400W is used as the standard per pyeong.
  • Q. What should you watch out for when buying a used air conditioner?
  • A. Check if there is sufficient refrigerant gas and if there is no noise from the outdoor unit compressor. It is also essential to verify the power capacity (circuit breaker] suitable for the installation environment.