With the rapid adoption of electric vehicles (EVs), finding ways to efficiently cool the cabin has become a high priority. Unlike combustion vehicles, EVs generate minimal waste heat that can be tapped for heating and air conditioning. That makes integrating effective climate control systems into EVs uniquely challenging.
Thankfully, several air conditioning technologies tailored specifically for electric vehicles have emerged.
There are a few key reasons why electric vehicles require purpose-built air conditioning systems:
At the heart of any EV’s HVAC system is the electric compressor or e-compressor. E-compressors are very similar to the 12V electric units adapted for classic car builds. However, e-compressors are optimized specifically for the demands of electrified mobility:
These purpose-built e-compressors from suppliers like Valeo, Mahle, and Hanon allow EV HVAC systems to provide effective, efficient cooling using minimal battery energy.
In mild weather, EVs can rely solely on efficient electric compressors for effective climate control. But in extreme cold, auxiliary heaters are essential to maintain range. Here too, heat pump systems are the ideal solution.
Heat pumps use a reversing valve to invert the HVAC cycle, pulling heat from the outside air and transferring it inside the cabin. By scavenging waste heat rather than generating new heat directly, heat pumps significantly reduce drain on the battery compared to electric resistance heaters.
Integrating the heat pump into the vehicles cooling system allows both heating and cooling modes to share components like evaporators, condensers, and fans, improving packaging while reducing complexity and weight.
Looking at real world examples shows how automakers are applying e-compressors, heat pumps and more to conquer the EV climate control challenge:
Tesla Model 3
The Model 3 relies on a compact e-compressor and flattened condenser integrated with the main HVAC assembly. The system uses a heat pump for efficient heating in cold weather. Smart controls preheat or precool the cabin when plugged in to reduce impact on range.
Ford F150 Lightning
Ford’s electric pickup can tow heavy loads, so efficient climate control is critical. The F150 Lightning’s e-compressor is tied to tow mode controls to ensure ample cooling capacity even under maximum load. With the extended range battery, Ford claims Lightning owners could drive over 300 miles before needing to recharge.
Rivian R1T
Rivian’s e-compressor feeds a dedicated heat pump with integrated chiller for optimum cold weather range. To keep weight and complexity low, Rivian uses a single air conditioning loop for the cabin, battery cooling, and drive systems. Unique controls allow owners to limit battery conditioning in favor of cabin climate.
Volkswagen ID.4
The ID.4 combines a Valeo e-compressor with a heat pump system to offer drivers range-optimized cooling and heating. To further reduce energy consumption, Volkswagen uses a predictive algorithm to heat or cool the battery and cabin to an ideal temperature before each trip based on past driving patterns.
Nissan Leaf
One of the first mainstream EVs, the Leaf keeps weight and cost low with a simple single-loop HVAC system. The efficient e-compressor provides air conditioning, while a 5kW PTC heater offers auxiliary warmth as needed. Updated models feature an available heat pump system for improved cold weather range.
The Future of EV Thermal Systems
Automakers and suppliers continue innovating to extend range and efficiency through advanced thermal management. Here are some emerging trends to watch:
Keeping Cool On the Road Ahead
As electric vehicles become more popular, delivering efficient and effective climate control will only grow in importance. With automakers pouring tremendous resources into next-generation thermal systems leveraging heat pumps, e-compressors, and the latest materials and controls, EV owners can stay cool on the road ahead. The future for electric vehicle climate control looks bright indeed!