Summer EV driving: staying cool without losing range

Heat affects an EV differently than cold does — the impact is smaller, but the causes and the fixes are different too.

The efficiency sweet spot

An analysis of 5.2 million EV trips found peak efficiency between 50°F and 88°F (10–31°C), with 70°F (21.5°C) identified as the single most efficient temperature. Once temperatures climb past that range, efficiency starts to decline again — air conditioning is the main reason why.

Practical summer strategies

• Precondition while plugged in — cool the cabin from grid power before you disconnect, the same principle as winter preheating.
• Use seat coolers where available, and switch to fan-only or recirculation mode once the initial heat is gone.
• Watch your speed — air resistance rises with the square of speed, so doubling your speed roughly quadruples the aerodynamic drag you're fighting.
• Park in shade wherever possible to reduce how much cooling the cabin needs in the first place.
• Avoid DC fast charging on the hottest days if you can — high heat combined with high charging power adds extra stress that can contribute to faster long-term degradation.

Myth check: do you actually charge more in the heat?

A real-world analysis of nearly 90,000 public charging sessions found the answer is largely no — EV drivers didn't take appreciably longer to charge, and vehicles didn't request materially more energy in hot weather.

These increases are small enough that heat-driven "range panic" charging isn't really showing up in the data — the bigger summer factor is simply air conditioning use while driving, not charging behaviour itself.