Range · 5 min read
Why range drops in winter
Cold batteries and cabin heat, and how much a heat pump gets back.
Every EV loses range in the cold. How much depends on the temperature, how you heat the cabin, and how much of your driving is short trips. Here's why it happens and how we estimate it.
Two things go wrong at once
- The battery is sluggish when cold. Lithium-ion cells release and accept energy less readily below freezing, and the car spends some energy warming them up.
- Heat isn't free. A gas engine throws off waste heat for the cabin. An EV has to make heat on purpose, and a resistive heater can draw several kW, about what the car uses to cruise around town.
In AAA's 2019 testing at 20°F with the heater on, the EVs they tested lost an average of about 40% of their range. Real-world fleet data usually shows smaller losses, around 20 to 30%, because people precondition, use seat heaters and drive at highway speeds where heat is a smaller share of the load.
What a heat pump buys you
A heat pump moves heat from outside air into the cabin instead of making it from electricity. In moderate cold it delivers two to three times as much heat per kWh as a resistive heater. The advantage shrinks in deep cold, but it still helps.
How EV Haven estimates winter range
That's for around 20°F with the cabin heated. It's an estimate, always labeled as one, and meant for comparing models rather than planning a trip to the mile.
How owners get range back
- Precondition while plugged in. Warming the cabin and battery from the wall instead of the battery is the biggest single win.
- Use seat and wheel heaters. They warm you, not the air, for a fraction of the power.
- Park in a garage if you can. A battery that starts at 40°F does far better than one at 5°F.
- Expect slower fast charging. Cold batteries accept less power. Navigating to a charger often preheats the battery.
Filter by winter range of 200+ miles in the finder.