12 000 BTU air conditioner room size (Explained)

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When you choose an air conditioner for your home, there are many things to look at. One of the main things to consider is the size of the room where the unit will be placed. But you have a question: what is the best room size for my 12000 BTU AC?

How big of a room can a 12000 BTU air conditioner?

A 12,000 BTU air conditioner is suitable for rooms between 450 and 550 square feet.

‘’The cooling capacity of an air conditioner is measured in British thermal units, or BTUs. Air conditioners with higher BTUs can cool larger rooms.”

The size of your room will determine how many BTUs you need. Smaller rooms require fewer BTUs to cool, while larger rooms require more.

What square footage does a 12000 BTUs cover?

A 12,000 BTU air conditioner can cool anywhere between 400 and 600 square feet.

The cooling power of a 12,000 BTU air conditioner is ideal for rooms that are around 400 to 550 square feet. For example, this includes rooms such as living rooms, bedrooms, family rooms and dining rooms.

However, there are many factors that can impact how many square feet an air conditioner unit can cool. All these items will play a role in the total cooling area for your space.

Can you use a 12000 BTU air conditioner in a small room?

You can’t use a 12,000 BTU air conditioner to cool a small room.

The size of your air conditioner should be based on the square footage of the room you want to cool. If you try to cool a small room with a large unit, it will not effectively remove humidity from the air, which will make you feel uncomfortable.

However, Portable air conditioners of different sizes are available for purchase. The smallest units have cooling capacities of 5,000 BTUs and can cool rooms up to 250 square feet in size.

How many BTU do I need for a 12×12 room?

need to heat a room: the size of the room and the height of the ceilings.

Room size. A 12×12 room is only 144 square feet — about half the size of a typical family room or 2/3rds of a small bedroom.

 If your walls aren’t well insulated, you may have trouble heating or cooling this space. You can expect that a 12×12 room will require about 4,000 BTUs to cool and about 5,000 BTUs to heat.

Having high ceilings in a 12×12 room means you’ll require more energy to warm it up in winter and cool it down in summer.

How many BTU do I need for a 20×20 room?

For a room 20 x 20 feet you need a BTU of 12,000.

 If the room gets a lot of sun exposure you will need an additional 25% more. Like we said earlier there are many factors that contribute to the size of the BTU unit needed for your home:

  • The number of people in the home.
  • How much insulation is in the walls and ceiling?
  • The type of windows (single or double-paned).
  • If there are any fireplaces in the home.
  • Types of appliances like gas stoves, etc.

How do you size an air conditioner for a room?

Before you purchase an air conditioner, you’ll need to determine the amount of space you want to cool. To calculate the square footage, multiply the room’s width by its length. For example, a 10-foot by 12-foot room would be 120 square feet.

Next, consider the type of window and how you plan to install the air conditioner. If you want to install it in a sliding window, measure the height and width of the opening between the two window panes (the metal frame that holds the glass). Then look for an air conditioner with a window kit that will fit that size.

If your window opens outwards or is a casement-style window (one that cranks from side to side), measure from one end of the window opening to the other. Then look for an air conditioner with a window kit that will accommodate these measurements.


It is very important to know the correct size of the air conditioners needed for your room a day before you are going to purchase one. This will help in saving money, time and energy.