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admin | | Updated: December 24th, 2019

What is BTU in Air Conditioning?

Have you ever wondered what the phrase “BTU” is when you’re looking to buy an air conditioning system for your home? Size matters when you’re looking for an air conditioning unit — but don’t think the bigger the BTU the better!

BTU or British Thermal Unit is the international measure of energy

The British thermal unit is a non-SI, traditional unit of heat

As the BTU rating increases so does the weight, size and cost of the air conditioner. Choose just right and you’ll feel just right — and save money, too.

Choose the right air conditioning system for the room of your choice

If you’ve been browsing online and you’ve found the air conditioning system you want before you go ahead and checkout, check what the BTU is on that unit!

  • Measure the room – Know the dimensions of the room, Work out the square metre area of the room in order to be accurate with the amount of BTU you need, typically, 20 BTUs per square foot is a good measurement.
  • Count the people that regularly occupy that room – If more than two people regularly occupy the room, add 600 BTUs for each additional person.
  • Is the room is heavily shaded or very sunny? – This is an important factor in the number of windows there are in the space, how many will contribute to the final BTU.
  • What room will the air conditioning system be in? – If the unit is used in a kitchen, for example, increase the BTU capacity by 4,000 BTUs.
  • Consider where you have the air conditioning unit. If you’re mounting an air conditioner near the corner of a room, look for a unit that can send the airflow in the right direction.

Wall-mounted air conditioners typically have a cooling capacity ranging from 7,000 to 24,000 British Thermal Units. Other air conditioning systems, such as the ceiling systems you find in offices, height and the size of your windows and doorways, mean more BTU power.

For a master bedroom, office or playroom, look for an air conditioning system with a capacity of 7,000 to 9,000 BTU. You’ll want one with good energy rating and low noise, such as a 19dBA for noise and A++ for energy ratings.

If you’re still not sure about the BTU rating and would like some expert advice, give one of our air conditioning pros a call on 01604 212732

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