Mini-split operating cost calculator
Estimate cooling and heating electricity cost from published efficiency ratings and your usage assumptions.
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What does it cost to run a mini-split?
A mini-split's running cost comes down to three things: how much heat it has to move (your climate and how long it runs), how efficiently it does it (its SEER2 for cooling and HSPF2 for heating), and what you pay per kilowatt-hour. Because inverter mini-splits modulate - running low and steady instead of blasting on and off - they are among the cheapest ways to heat and cool a room, often less than half the cost of electric resistance heat or window units.
This calculator turns those variables into a monthly and yearly estimate so you can compare the true running cost of one system against another, or against whatever you are replacing.
Why efficiency ratings actually matter here
Two mini-splits with the same BTU capacity can cost noticeably different amounts to run. A higher SEER2 (cooling) or HSPF2 (heating) means more comfort per kilowatt-hour - and over a system's 12-to-15-year life, the efficient one can save more than its higher sticker price. That is why our model pages score efficiency, and why the payback calculator exists: to weigh a pricier, efficient unit against a cheaper one over time.
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Frequently asked questions
- How much does a mini-split cost to run per month?
- For a single-zone head, commonly $20-$60 a month depending on climate, runtime, the unit's efficiency, and local electricity rates - often less for cooling-only in a mild climate, more for heating through a cold winter. Enter your specifics above for an estimate tied to your situation.
- Are mini-splits cheaper to run than central AC or window units?
- Usually yes. Inverter mini-splits modulate their output and only condition the rooms you use, so they avoid the duct losses of central systems and the constant on/off cycling of window units. In heating, a mini-split heat pump is typically far cheaper than electric baseboard or space heaters.
- What makes a mini-split cost more to run?
- Low efficiency (a low SEER2/HSPF2), an oversized unit that short-cycles, a cold climate that demands long heating runtime, high local electricity rates, and setting it far from the outdoor temperature. Right-sizing and choosing an efficient model are the biggest levers you control.