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Mini-Split Electricity Cost: How Much Does It Use Per Month? (2026)

by Dua Jones April 16, 2026

A mini-split uses between 85 and 720 kWh of electricity per month depending on its size, how many hours per day it runs, and whether it is heating or cooling. For a typical 12,000 BTU unit running 8 hours per day in cooling mode, monthly electricity costs range from $22 to $38 in most US and Canadian markets. This guide breaks down the real numbers so you can estimate your own usage accurately.

Mini-Split Electricity Use by Size

Unit Size (BTU)	Average Wattage	Monthly kWh (8 hrs/day)	Monthly kWh (12 hrs/day)
6,000	350–500W	85–120 kWh	130–180 kWh
9,000	500–750W	120–180 kWh	180–270 kWh
12,000	700–1,000W	170–240 kWh	250–360 kWh
18,000	1,000–1,500W	240–360 kWh	360–540 kWh
24,000	1,400–2,000W	340–480 kWh	500–720 kWh
36,000	2,000–3,000W	480–720 kWh	720–1,080 kWh

Monthly Cost by Electricity Rate

Multiply your monthly kWh by your electricity rate to get your actual monthly cost. Electricity rates vary significantly by region.

Region / Rate	Typical $/kWh	12K BTU Monthly Cost (8 hrs/day)
Quebec (low)	CAD $0.09	CAD $15–$22
US South (low)	$0.11	$19–$26
US National Average	$0.16	$27–$38
Ontario / BC	CAD $0.13–$0.17	CAD $22–$41
California	$0.28–$0.35	$48–$84
Hawaii (highest)	$0.40+	$68–$96

Why Mini-Splits Use Less Electricity Than Other Systems

Two technologies make mini-splits significantly more efficient than traditional HVAC:

Inverter compressor: Traditional air conditioners and heat pumps cycle on and off at full power. Mini-splits use inverter-driven compressors that adjust speed continuously — ramping up for rapid cooling or heating, then slowing down to maintain the setpoint with minimal energy. This typically reduces energy use by 30–50% compared to traditional fixed-speed systems.

No duct losses: Central HVAC systems lose 15–25% of their heated or cooled air through leaks and heat transfer in the ductwork, especially when ducts run through unconditioned attics or crawl spaces. Mini-splits deliver conditioned air directly into the room — no ductwork, no losses.

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Heating vs Cooling Electricity Use

Heating typically uses 20–40% more electricity per hour than cooling for the same room. This is because:

Winter temperature differences (indoor vs outdoor) are usually larger than summer differences, requiring more work from the heat pump.
Defrost cycles consume extra energy during cold-weather operation.
Heat pump efficiency decreases as outdoor temperatures drop, so colder regions see higher electricity use for the same heating output.

If you plan to use a mini-split as your primary heat source in a cold climate, expect winter electricity bills to be noticeably higher than summer bills.

How to Calculate Your Exact Electricity Cost

Use this formula:

(Average wattage ÷ 1,000) × hours per day × 30 days × your electricity rate = monthly cost

Example: A 12,000 BTU unit at 800W average, running 8 hours/day at $0.16/kWh:
(800 ÷ 1,000) × 8 × 30 × $0.16 = $30.72 per month

Tips to Reduce Mini-Split Electricity Use

Clean the filter every 2–4 weeks. A dirty filter forces the unit to work harder, increasing energy use by 5–15%.
Set a consistent temperature. Inverter systems are most efficient when maintaining a steady setpoint. Avoid large temperature swings.
Use sleep mode at night. Sleep mode reduces fan speed and gradually adjusts the temperature, lowering nighttime energy use.
Close doors and windows. Leaking conditioned air forces the system to run longer.
Turn it off when you leave. For longer absences, turn the unit off rather than leaving it running in an empty room.
Schedule annual maintenance. A professional tune-up ensures the system runs at peak efficiency.

Frequently Asked Questions

Does a mini-split use a lot of electricity?

No. A 12,000 BTU mini-split uses about as much electricity as a hair dryer on medium setting — but runs at much lower power most of the time thanks to the inverter compressor. Monthly electricity costs are typically $22–$38 in average US markets.

How much electricity does a mini-split use per hour?

A 12,000 BTU mini-split typically uses 700–1,000 watts per hour when running at full capacity. At part-load (most of the time), actual consumption is often 300–600 watts per hour. This is significantly less than a 1,500W space heater and roughly half the hourly consumption of a typical window AC.

Is it cheaper to run a mini-split 24/7 or turn it on and off?

In most cases, running the mini-split 24/7 at a moderate setpoint uses similar or less energy than cycling it on and off. Inverter compressors operate most efficiently at steady part-load. For longer absences (more than a few hours), turning the unit off saves energy.