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Mini-Split Heating Efficiency at Different Temperatures (2026 Guide)

by Dua Jones May 25, 2026

A mini-split's heating efficiency changes significantly with outdoor temperature — it is at its most efficient on mild days and least efficient on the coldest days. This article presents the data in chart form, explains what drives the changes, and gives you the numbers you need to compare cold-climate vs standard models across the full temperature range you experience in your climate.

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Heating COP at Different Outdoor Temperatures

Outdoor Temperature	Standard Model COP	Cold-Climate Model COP	Electric Resistance COP
+15°C (59°F)	4.0–5.0	4.0–5.0	1.0
+8°C (47°F) — HSPF rated condition	3.5–4.5	3.5–4.5	1.0
0°C (32°F)	2.5–3.5	3.0–4.0	1.0
−8°C (17°F)	2.0–2.5	2.5–3.2	1.0
−15°C (5°F)	1.5–2.0	2.0–2.8	1.0
−20°C (−4°F)	1.3–1.7 or may not operate	1.8–2.3	1.0
−25°C (−13°F)	Below rated minimum	1.5–2.0	1.0
−30°C (−22°F)	Will not operate	1.3–1.7 (extreme cold models only)	1.0

Reading the Chart: Key Insights

1. Mini-splits are always more efficient than electric resistance above their operating minimum. Even at −25°C, a cold-climate mini-split at COP 1.5–2.0 uses 33–50% less electricity than baseboard heat for the same output.

2. The gap between standard and cold-climate models widens in the cold. At 0°C the difference is modest; at −15°C the cold-climate model delivers 25–40% more heating capacity for the same electricity input.

3. Shoulder seasons (0–10°C) are when heat pumps shine most. At these temperatures, COP 3.0–4.5 means the heat pump delivers 3–4.5 units of heat per unit of electricity — the most cost-effective heating possible from an electric system.

Heating Capacity Retention (BTU Output % of Rated)

Temperature	Standard Model	Cold-Climate (H2i / Aurora)
+8°C (rated)	100%	100%
−8°C	~70%	~95–100%
−15°C	~50%	~75–85%
−25°C	Near zero / off	~55–65%

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Frequently Asked Questions

What COP should I expect from a mini-split during a typical Canadian winter?

For most of southern Canada (Ontario, Quebec, BC, Atlantic Canada), average winter temperatures sit in the −5°C to −15°C range. A cold-climate mini-split in this temperature range operates at average COP 2.0–3.0 across the heating season — meaning it delivers 2–3 units of heat per unit of electricity on a seasonal average. This is well above the 1.0 of electric baseboard and competitive with gas furnaces at most current electricity-to-gas price ratios.