How Many Amps Does A Mini Split Use?

Are you considering getting yourself a mini-split air conditioner but unsure if you have the breaker capacity?  Unfortunately, there isn’t a one-size-fits-all answer to how many amps a mini-split uses; the amperage required will depend on the size of the system in BTUs.  Generally, a small mini-split system will need approximately 20 amps, while a larger multi-unit system could require upwards of 40 amps.  The actual amps drawn by the unit during operation are generally lower than the necessary circuit amperage, but how much is drawn will depend on a number of factors including voltage and intensity of usage.

How Many Amps Does A Single Zone Ductless Mini Split Draw?

While you can find 7,000 and 9,000 BTU units, most single zone units will be 12,000 BTUs.  BTUs are a measurement of how much cooling capacity the unit has; you’ll want approximately 20 BTUs per square foot of space.  This means a 12,000 BTU unit can sufficiently cool a 600-square-foot space.  If you live in an apartment, this may be sufficient for you.

In terms of amperage, a 12,000 BTU mini split will need a 20 amp breaker.  The mini-split unit will not ultimately draw that many amps during standard operation, but it will need 20 amps available for special cases of high-intensity usage.  It may be possible to run this system on a 120v power supply, but a dedicated 240v is recommended to avoid circuit tripping.  Always check the manual for specifications regarding your particular unit.

How Much Amperage Does A Multi-Zone Mini-Split System Use?

A multi-zone mini-split system will require more BTUs shared across several units; multi-zone mini-splits come in a wide variety of BTU ratings.  Depending on the size and number of rooms you intend to cool with this system, your BTU needs will vary.  For example, smaller multi-unit systems may be 24,000 BTU with two 12,000 BTU units, which would service two 600 square foot rooms.  For an open floor plan, you could get a 36,000 BTU system with two 18,000 BTU units, servicing two 900 square foot spaces. If you have 4 rooms of 600 square feet each, you might opt for a 48,000 BTU system with four 12,000 BTU units.  There are many different combinations to choose from, and the best combination for you will depend on your space.

A 24,000 BTU system would need a 25 amp breaker; a 36,000 BTU system would need a 30 amp, and a 48,000 BTU system needs 40 or 50 amps.  For systems of this size, you’ll need a 240v double-pole.  As before, these specifications may vary depending on your exact model.  The mini split uses less amperage on average than it will need on the breaker, but it is important to have a breaker amperage high enough for intense use.

Choosing The Right System

Mini splits can be a great option for home owners looking for an energy efficient system.  Ductless mini split systems are an extremely popular option, which can work well in homes that do not have preexisting ductwork.  This can save time and money on filters and the construction of ducts.  Mini-split heat pump versions are also available and can function as both a heater and air conditioner.  The dual heating and cooling ability helps save money on additional systems, allowing you to use the same system year-round, regardless of the outdoor temperature.

No matter what air conditioning system you choose for your home, be sure to work closely with an electrical expert to ensure the system works as intended.  At Green City Heating & Air, we have experienced professionals who can help you pick and install the right system for your home.  If you’re overwhelmed by all the options, reach out to our team for a consultation either by phone or through our online contact form.