The new 18-inch-wide Dynasys SL APU from Perrin Manufacturing is an automotive-style HVAC system. It’s available with a multi-purpose console that fits virtually all major day cab configurations and an under-bunk version that accommodates most traditional sleeper cab styles.

Unlike the existing , the new SL does not include an AC power generator, but focuses solely on climate control of the truck’s cabin. The system is thus 25% lighter at 295 lb. It uses a belt-driven AC compressor to generate up to 24,000 BTU/hr of cooling power and heat dissipation from its diesel powerplant to deliver up to 8000 BTU/hr of heating strength.

Both APUs are compact and fit the frame-rail mounting space of most North American truck brands.

They’re claimed to be the only APUs on the market to use a corrosion-resistant stainless-steel outer envelope and heavy-duty zinc-plated frame with powder coating. Also unique to the Dynasys brand is its in-cab, touch-screen user interface controller.

To add to operator comfort, the units are also designed with advanced noise-reduction technology, keeping them at or below 75 dB under full load, producing about a third less noise than an idling heavy diesel truck.

Both are powered by an easily accessed two-cylinder Caterpillar diesel engine, boasting a Tier-4 EPA rating, the lowest for its class. Dynasys APUs attach to a power unit’s existing fuel tank and operate on less than one quarter of the diesel fuel needed to idle a class 8 diesel engine.

The Dynasys APU is also available with shore power, which provides the additional flexibility of plugging into any 110-volt outlet to work independently from the APU engine for fuel savings with minimal noise.

The SL day cab model has an HVAC console with four large multi-directional air vents, two large cup holders, and two storage trays, as well as a USB charging port and a 12-volt DC power receptacle.

Sales and service of Dynasys APU products are available in the U.S. and Canada through 145 dealer locations.