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.
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.
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.
|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|
|ZONE 1||ZONE 2|
|1.5 Tons||600 – 900 sf||600 – 950 sf|
|2 Tons||901 – 1200 sf||951 – 1250 sf|
|2.5 Tons||1201 – 1500 sf||1251 – 1550 sf|
|3 Tons||1501 – 1800 sf||1501 – 1850 sf|
225 square feet
The square footage of a room 15 feet wide and 15 feet long is 225 square feet. The square footage is calculated by multiplying the width (15 ft) by the length (15 ft).
Room size and power consumption
For instance, a 1-ton window AC or a 1.5 ton split AC is an ideal choice for rooms measuring up to 150-160 sq ft.
Rule of thumb. A 1 ton (12,000 BTUH) unit is doable in the space you want to cool. To handle the hot, humid summer heat of your area, I would increase it to 15,000 – 16,000 BTUH.
$40.11 per year to run or 47.75 cents a day or 11.9c per hour. 2. A 3.5 kW system running for 8 hours a day for 12 weeks (84 days) of the year at 24 degrees will cost appox. $134.16 a year or $1.59 per day to run.
As a general rule we advise you to buy an Air Conditioner with a minimum 7000BTUs as this is the minimum required to call a small room (18sq/m) on a hot day. Medium rooms (24sq/m) need around 10,000BTUs and larger rooms and office spaces (36sq/m) require around 15000BTUs.
|Room Size||Aircon Horsepower (HP)|
|12 to 17 sq. m||0.75 HP|
|18 to 22 sq. m||1.0 HP|
|23 to 27 sq. m||1.5 HP|
|28 to 40 sq. m||2.0 HP|
When looking for the quick answer to how much air-conditioning power you’ll need to adequately cool a 1,300-square-foot space, the answer is 23,000 BTUs per hour of air conditioning power. This is the base capacity needed for a 1,200- to 1,400-square-foot house.
|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|
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.
|Home Sq Footage||Air Conditioner Size (tons)|
|600 – 1,000 square feet||1.5 tons|
|1,000 – 1,500 square feet||2 tons|
|1,500 – 2,000 square feet||3 tons|
|2,000 – 2,500 square feet||4 tons|
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. Your air conditioner will need to be able to remove this much heat from your home per hour to keep a stable temperature.
To determine how many bags of concrete you will need, divide the total cubic yards needed by the yields, at 4 inch thick, for a 12×12 slab you will need 1.76 yards of concrete, so number of 80lb bag of concrete = 1.76 ÷ 0.022 = 80 bags, No. of 60lb bag = 1.76 ÷ 0.017 = 104 bags & No.
|Area (Square Feet):||BTU||Tonnage|
|600 sq ft||12,000 BTU||1 Ton|
|900 sq ft||18,000 BTU||1.5 Tons|
|1,200 sq ft||24,000 BTU||2 Tons|
|1,500 sq ft||30,000 BTU||2.5 Tons|
A 1.5 ton AC is bit expensive, consumes more electricity, but has faster cooling time and can cover larger room areas (around 140-180 square feet). On the other hand, a 1 ton AC is cheaper, has lower power consumption, and is suitable for a room-sized up to 140 square feet.
For a room of less than 200 square feet, one should use a 1.5 ton air conditioner. A 2 ton air conditioner is enough to cool a room that is between 200 and 260 square feet.
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.
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.
|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.|
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