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Danhard, specialty vehicle HVAC manufacturer since 1963

12V Engine-Driven HVAC Systems

Evaporators, condensers, heaters, and combination heat/cool units that tie into your vehicle's existing engine-driven systems. Every component is selected and configured specifically for your vehicle by Danhard's engineering team.

12V

Cooling for 12V systems is accomplished with an engine-driven compressor. Danhard supplies evaporators, condensers, heaters, optional standalone compressors, and all supporting components. Danhard's engineering team guides component selection at no charge.

Evaporator Units

Interior cooling units operating on the vehicle's 12-volt electrical system. In standard configurations, they tie into the vehicle's existing engine-driven compressor. When more cooling is needed, Danhard can supply a secondary dedicated compressor and mount-and-drive kit.

Key Considerations

  • Available mounting space determines which evaporator coil size
  • Louvered or ducted determines blower motor selection
  • Tie-in or dedicated compressor

Blower Options

  • Brushed (standard) for louvered applications
  • Brushless (higher CFM, 2x rated lifespan) for ducted setups

Construction

Tube-and-fin with optimized fin spacing for efficient heat transfer and resistance to debris buildup.

Condensers

Exterior heat-rejection component. Always designed alongside the evaporator to ensure optimal system performance and cooling capacity.

When Needed

  • Tie-in applications (recommended to supplement OEM condenser)
  • Dedicated compressor applications (required)

Mounting Options

  • Underbody (most common)
  • Rooftop (non-armored vehicles)
  • Forward-mount

Construction

Tube-and-fin design. Competitor parallel-flow designs clog with debris within months. Danhard's proven tube-and-fin construction delivers long-term reliability.

Heaters

Standalone heating units that tie into the vehicle's hot engine coolant circuit. Most common in ambulance split systems with cooling evaporator at cabinet top and heater at baseboard level. All coolant-based systems with no resistive electric heaters in 12V products, ensuring efficient heating from the engine's waste heat.

Combination Heat/Cool Units

Interior units with both cooling and heating coils in a single package. The primary application is fire trucks, where Ferrara uses three per truck for comprehensive climate control. Also used in armored vehicles and other specialty applications. More compact than split systems, suitable when space is limited or when integrated heating and cooling in one unit is preferred.

Trusted for Engine-Driven Performance

Optimized for Your Vehicle

Danhard's engineering team evaluates your vehicle's OEM compressor capacity, available mounting space, and climate requirements to recommend the right 12V components. No one-size-fits-all approach.

Cost-Effective Cooling and Heating

By leveraging the vehicle's existing engine-driven compressor and coolant circuit, 12V systems deliver climate control without the expense of a self-contained AC-powered system.

Under 1% Warranty Claim Rate

Tube-and-fin construction on every coil and condenser, and 95%+ U.S.-sourced components. When a warranty claim is needed, we make it right.

Free Engineering Support

Mark Nation, our lead engineer with 30+ years of specialty vehicle HVAC experience, guides every customer through component selection at no charge.

Frequently Asked Questions

What is the difference between 12V systems and AC-powered systems?
12V systems tie into your vehicle's existing engine-driven compressor for cooling and hot coolant circuit for heating. AC-powered systems include their own dedicated compressor and run on AC electrical power. 12V systems are typically more cost-effective when the OEM compressor can support the additional cooling load.
When should I use a dedicated compressor with a 12V system?
When the vehicle's OEM engine-driven compressor does not have sufficient capacity for the additional rear compartment cooling demand, Danhard supplies a secondary dedicated compressor with a mount-and-drive kit. Our engineering team evaluates your compartment size, climate requirements, and OEM compressor specs to recommend whether tie-in or dedicated is appropriate.
What are the blower motor options for 12V evaporator units?
Danhard offers brushed motors (standard configuration, suitable for louvered systems) and brushless motors (higher CFM output, 2x rated lifespan, recommended for ducted setups). Brushless motors deliver superior performance in demanding applications where higher air volume is needed.
Do I need a condenser with my 12V system?
For tie-in applications, Danhard recommends an auxiliary condenser to supplement your OEM condenser. For dedicated compressor applications, a dedicated condenser is required. The condenser is always designed alongside the evaporator to ensure proper heat rejection and system performance.
How does Danhard help with component selection for 12V systems?
Danhard's engineering team provides free component selection guidance. We evaluate your vehicle specifications, available mounting space, blower requirements, and climate needs to recommend the right evaporator size, condenser type, heater configuration, and whether tie-in or dedicated compressor is best.

Need Help Selecting the Right 12V Components?

Let's talk about your vehicle. Call us to discuss the right 12V system configuration for your specific application.

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