As a rule of thumb, an air conditioner needs 20 Btu for each square foot of living space. But other considerations, such as the ceiling height and the size of your windows and doorways, might call for more cooling power. To measure your room, multiply the length by the width.May 30, 2021
To calculate the size of the air conditioner you need for a room, first, multiply the length of the room with its width. Then multiply it with 25 BTU to get the ample cooling for the room under different weather conditions. For example, if the room is 15 feet long and 12 feet wide, it comes to 180 square feet.
|Area To Be Cooled (square feet)||Capacity Needed (BTUs per hour)|
|100 to 150||5,000|
|150 to 250||6,000|
|250 to 300||7,000|
|300 to 350||8,000|
Budget air conditioners range from 5,000 BTU, which can handle about 150 square feet, to 12,000 BTU, enough to cover about 550 square feet.
|Room size||Example||Approx. capacity|
|Small (up to 20m2)||Bedroom, study, small kitchen||2–2.5kW|
|Medium (20–40m2)||Bedroom with ensuite, small lounge||2.5–5kW|
|Large (40–60m2)||Large bedroom, mid-sized lounge, large kitchen||4–6kW|
|Extra large (60+m2)||Open-plan areas, large lounges||5–9kW|
If your home is 2000 square feet, you can calculate your HVAC needs the same as you would for a 1600 square foot home. Assuming one ton of cooling capacity can cool 400 square feet of your home, you’ll need about 5.0 tons of air conditioning capacity. Multiply this by 12,000 BTUs, and you’ll get 60,000 BTUs.
Recommended BTU By Room Size
If you are looking for an air conditioner for a room measuring say 10′ x 15′ (150 square feet), the recommended BTU range is up to 5400. … Once you get into 340 and 400 square feet per room, you’d need an 8,000 or 9,000 BTU air conditioner, respectively.
|Area (Square Feet):||BTU||Tonnage|
|2,700 sq ft||54,000 BTU||4.5 Tons|
|3,000 sq ft||60,000 BTU||5 Tons|
|3,300 sq ft||66,000 BTU||5.5 Tons|
|3,600 sq ft||72,000 BTU||6 Tons|
350 – 400 sq. feet: 9,000 BTUs. 400 – 450 sq. feet: 10,000 BTUs.
A 2.5kW system is suitable for a bedroom ideally and this would mean that an area up to 18m2 would be sufficient. … A 3.5kW system is ideal for a large bedroom that is more of a master bedroom with an ensuite.
For a room 20m2 to 30m2, a 3.5kW unit should cool the room; For a room 30m2 to 45m2, a 5-6kW unit should cool the room; and. For a room 45m2 to 65m2, a 7-8kW unit should cool the room.
The size of your air conditioner depends on the size of the room to be cooled. Generally, you will need about 1.25-1.7 kilowatts of power per 10 sqm if the ceiling height is standard. To work out what size you need multiply the width by length of the room to get you floor space.
|House Square Footage||BTUs Needed|
|500 – 700||14,000|
|700 – 1,000||18,000|
|1,000 – 1,200||21,000|
|1,200 – 1,400||23,000|
144 square feet
How many square feet is a 12×12 room? The square footage of a room 12 feet wide by 12 feet long is 144 square feet. Find the square footage by multiplying the width (12 ft) by the length (12 ft).
|ZONE 1||ZONE 3|
|3 Tons||1501 – 1800 sf||1601 – 1900 sf|
|3.5 Tons||1801 – 2100 sf||1901 – 2200 sf|
|4 Tons||2101 – 2400 sf||2201 – 2600 sf|
|5 Tons||2401 – 3000 sf||2601 – 3200 sf|
Units that are 2 tons can cool off 901-1200 square feet spaces. Units that are 2.5 tons can cool off 1201-1500 square feet, etc. This pattern continues up to units of 5 tons that cool off 2401-3000 square feet, with every half ton increase adding about an additional 300 square feet.
Installing a central air conditioner into a 2000 square ft. home with an existing forced air furnace heating system (that has all ductwork installed properly) would cost between $3,000 to $4,000.
|BTU Chart Based on Room Size|
|150 sq. ft.||5,000 BTU’s||700 sq. ft.|
|250 sq. ft.||6,000 BTU’s||1,000 sq. ft.|
|300 sq. ft.||7,000 BTU’s||1,200 sq. ft.|
|350 sq. ft.||8,000 BTU’s||1,400 sq. ft.|
In general, a 5,000 to 6,000 BTU air conditioner can cool between 100 and 300 square feet. Seven thousand to 8,200 BTU units are adequate for cooling 250 to 550 square feet, while 9,800 to 12,500 BTU models cool up to 950 square feet.
The difference between a 5000 BTU vs 6000 BTU air conditioner is that the 5000 BTU unit covers 100 to 150 square feet while a 6000 BTU unit will cover 150 to 250 square feet. Therefore, 6000 BTU air conditioners are suitable for larger rooms than the 5000 BTUs.
The most common window air conditioning units come in cooling capacities ranging from 5,000 to 12,000 Btu. A 12,000 Btu air conditioner can cool between 450 and 550 square feet of floor space. A 12,000 Btu unit could cool a room 25 feet long by 20 feet wide that has 500 square feet of floor area.
A window unit comes in at a way cheaper price of around $300-$1,500 with monthly running costs of about $30-$80 depending on its usage. However, if you’re planning to cool more than 5 rooms, then one central air conditioner will be cheaper in the long run.
An oversized HVAC unit can make your home’s inside temperature uncomfortable. An HVAC system with excess capacity can heat or cool your home faster, but that speed often results in a couple of other issues. … As a result, you could end up with a number of hot or cold spots throughout your home.
Pro Tip: as a rule of thumb, the maximum AC unit size you need to install should not be more than 15% more than the BTU’s you need to cool your house. This means that if your house requires a 24,000 BTU unit (2 tons), you should not install one that is larger than 30,000 BTU’s (3 tons) to maintain energy efficiency.
A 24,000 BTU air conditioner would work best in a room between 1,400 and 1,500 square feet.
For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs.
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