Size and Power (Mini Split Air Conditioner Buying Guide)

Each indoor ductless unit offers a set number of BTUs of cooling power. For single-zone units, you simply need to know the number of BTUs associated with the indoor unit and make sure it fits the square footage you're cooling. 

For multiple zone systems, both the outdoor and indoor units have a BTU rating attached to them. One benefit of a ductless split system is each indoor unit runs independently.

Check out our square footage and BTU comparison chart below. Keep in mind if you're purchasing a multi-zone system, you need to look at the BTU rating for each unit (or zone). For example, an AC may use 30,000 BTUs total, with each indoor unit using 9,000 BTUs and the outside unit using 12,000 BTUs.

Area To Be Cooled (Square Feet)       Capacity Needed (BTUs Per Hour)

100 to 150 square feet                                     5,000 BTUs

150 to 250 square feet                                     6,000 BTUs

250 to 300 square feet                                     7,000 BTUs

300 to 350 square feet                                     8,000 BTUs

350 to 400 square feet                                     9,000 BTUs

400 to 450 square feet                                     10,000 BTUs

450 to 550 square feet                                     12,000 BTUs

550 to 700 square feet                                     14,000 BTUs

700 to 1,000 square feet                                  18,000 BTUs

1,000 to 1,200 square feet                               21,000 BTUs

1,200 to 1,400 square feet                               23,000 BTUs

Environmental conditions should also be taken into consideration when sizing your space for a mini split AC. If any of them are applicable to you, increase the number of BTUs by the percentage shown:

Environmental Condition


Ceiling Height: If your ceilings are higher than 8 feet, you should increase your number of BTUs (Increase 20%).

Insulation: Poorly insulated areas require more power to cool (Increase 30%).

Climate: In areas with seasonal temperatures often exceeding 90 degrees F. (Increase 30%).

Voltage

Voltage is another important consideration for your ductless mini split's power requirements. Smaller-powered mini splits use a standard 110- to 120-volt plug, which most homes are wired for, but larger units require higher voltage. These models use a 220- to 240-volt plug; make sure your home's voltage matches your unit's before purchasing. Using the incorrect voltage can cause the circuit to break, a loss of efficiency, or even cause a fire.

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Air conditioning Btu for Homeowners

Air Conditioning Btu – Measure how much heat energy air conditioner unit produce.

An air conditioner manufacture needs away to compare the amount of heat is produce on specific period and need to know how much heat is remove on specific period (day, hour, minute).

What is air conditioning Btu?

Btu is a British thermal unit. It’s a unit of heat energy. Btu defines as the amount (quantity) of heat needed to raise the temperature of 1 pound of water to 1 degree F.

For example: when 5 lb of water is heated from 10°F to 20°F. 50 Btu of heat energy is added to the water. To look at in a different way, the water now contains 50 Btu of heat energy.

Here is the Btu’s formula:

Btu = Wt in lb. x change in temperature in °F

Btu = 5 lb X (10-20)

Btu = 5 x 10

Btu = 50 Btu

HVAC technician used the terms Btu to describe the quantity of heat or heat content. Btu explains the amount of heat energy contains in a substance. In the example above, the water contains 50 Btu.

Let’s said a furnace has 15000 Btu. It means that the furnace wills produce 15,000 Btu of heat within specific period.

When it comes to air conditioner, it entirely difference. 15,000 Btu air conditioners mean that the air conditioner unit will remove 15,000 Btu of heat energy from a resident.

Each components of heating or air conditioner unit is rated base on their ability to remove heat or add heat. If the hvac equipment is not rated, it would be hard to choose the best air conditioner unit or heating unit.

Ton of Refrigeration or Ton of Air Conditioner.

Air conditioning Btu is a unit use to measure quantity of heat energy and ton of refrigeration is a measurement unit use to size air conditioner unit or refrigeration units.

The terms ton of refrigeration goes back went they used ice as the source to remove heat. It requires 144 Btu of heat energy to melt one pound of ice at 32°F to one pound of water at 32°F.

Ton of refrigeration refers to the amount of heat needed to melt 1 ton of ice in a day (24 hours). 1 ton of refrigeration is equal to 2000 pound of refrigeration (1 ton = 2000 lb). Here how to converts ton of refrigeration to Btu:

2000 lb x 144 Btu/lb = 288,000 Btu

288, 000 Btu is how much heat removes within 24 hours. In one hours, the air conditioner unit removes 12, 000 Btu of heat (288, 000 Btu/ 24 = 12, 000 Btu) or in minute, it would be 200 Btu /min.

Here is different prospective. 1 Ton of air conditioner unit will remove 12, 000 Btu of heat per hours.

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