What is an EV heat pump and why do they matter?
If you're thinking of buying an electric vehicle, you may have come across the term 'heat pump'. But what exactly is it, why does it matter, and could it make a real difference to your EV's range in winter?
The Cazoo editorial team
Published on 27 May 2026 | 5 mins read
Electric vehicles have transformed the way we think about motoring, but one of the most common concerns among drivers remains range anxiety – particularly during the colder months.
That's where an EV heat pump comes in. It's one of the most important yet underappreciated technologies fitted to modern electric cars, and it could save you a significant chunk of your battery on a cold winter's morning.
So, what is an EV heat pump, how does it work and why should it be on your checklist when shopping for a used electric car?
What is an EV heat pump?
A heat pump is a heating and cooling system that moves heat from one place to another, rather than generating heat by burning fuel or using electrical resistance. In a conventional home or car heating system, energy is consumed to create warmth. A heat pump, by contrast, extracts ambient heat from the outside air and transfers it into the cabin – making it far more energy-efficient.
In electric vehicles, a heat pump replaces or supplements the traditional resistive heating system. Where a resistive heater works like a giant electric fan heater – drawing heavily from the battery to generate heat – a heat pump can produce the same warmth using a fraction of the energy. Typically, a heat pump can deliver two to three units of heat energy for every one unit of electrical energy it consumes, a ratio known as the Coefficient of Performance (COP).
You'll find heat pumps fitted as standard on many modern EVs, including the Nissan Leaf (on higher trims), Tesla Model Y, Volkswagen ID.4, Hyundai Ioniq 5 and Kia EV6, among others.
How does an EV heat pump work?
The basic principle of an EV heat pump is similar to that of a refrigerator – but working in reverse. A refrigerant fluid circulates around the system, absorbing heat from the outside air (even in cold temperatures, there is usable thermal energy in the atmosphere) and compressing it to raise its temperature before releasing it into the cabin.
Most modern EV heat pumps are sophisticated enough to also recover waste heat from the electric motor, battery, and other onboard electronics, channelling it into the cabin heating system. This makes them even more efficient, as they're making use of energy that would otherwise be wasted.
In summer, the same system can also work in reverse to cool the cabin, functioning as an air conditioning unit – making it a year-round efficiency tool, not just a winter one.
Why does a heat pump improve EV range in winter?
This is the crux of why heat pumps matter so much to EV drivers. Cold weather is one of the biggest enemies of electric vehicle range, and cabin heating is a major culprit.
Without a heat pump, an EV must use its battery pack directly to power the resistive heater. On a cold day, this can consume anywhere from 3kW to 7kW of power – a significant drain on the battery that can reduce range by 20% to 40% in very cold conditions.
With a heat pump fitted, the energy required to heat the cabin can be cut by as much as 50% compared to resistive heating. In real-world terms, this could mean the difference between arriving at your destination with charge to spare or having to hunt for a charge point. For drivers who regularly travel longer distances in winter, or those who rely on their EV for daily commuting, this is a compelling advantage.
Independent tests by organisations such as the Norwegian Automobile Federation have consistently shown that EVs with heat pumps suffer significantly less range loss in cold weather than those without. On some models, heat pumps have been shown to preserve up to 25% more range at low temperatures compared to resistive heating alone.
Should you look for a heat pump when buying a used EV?
Absolutely – and here's why. If you're buying a used electric car and you live in the UK, where winters can be cold and wet, a heat pump should be near the top of your checklist. While it may not appear as headline-grabbing as battery size or charging speed, its real-world impact on efficiency and usability is substantial.
Not all EVs come with a heat pump fitted as standard, and on some models it may be an optional extra that was or wasn't chosen by the original owner. It's always worth checking the vehicle's specification sheet or asking the seller whether a heat pump is included before purchasing.
As with any used car purchase, it's also important to carry out a thorough vehicle history check to ensure the car has been properly maintained and has a clean history. You'll also want to factor in running costs, including road tax for your EV, which has changed in recent years.
Key benefits of an EV heat pump at a glance
- Significantly improved range in cold weather by reducing battery drain from heating the cabin
- Two to three times more energy-efficient than traditional resistive heating systems
- Also functions as air conditioning in summer, keeping the cabin cool without excessive battery use
- Recovers waste heat from the motor and electronics, further improving efficiency
- Increasingly common on newer EVs, making it a feature to look for on the used market
The bottom line
A heat pump might not be the most talked-about feature on an electric vehicle, but it's one of the most practically important – especially for UK drivers facing cold winters. By dramatically reducing the amount of battery power needed to keep the cabin warm, it protects your range when you need it most and lowers your overall running costs.
Whether you're browsing used electric cars or comparing new models, always check whether a heat pump is included in the specification. It's a small detail that makes a big difference on the road.