Mitsubishi PAA-BA42NL & PUZ-AK42NLHZ 42,000 BTU 17.1 SEER2 Cased Coil Hyper Heat Pump System - R454B

Mitsubishi PAA-BA42NL & PUZ-AK42NLHZ: 42,000 BTU Hyper-Heat Split System

The Mitsubishi PAA-BA42NL indoor cased coil paired with the PUZ-AK42NLHZ H2i® Hyper-Heating outdoor unit delivers exceptional year-round comfort with powerful cooling performance and industry-leading cold-climate heating capabilities. Designed for residential and light commercial applications, this 42,000 BTU hybrid-ready split system combines Mitsubishi’s advanced inverter technology, H2i® Hyper-Heating performance, and intelligent furnace compatibility to provide reliable comfort even in extreme winter conditions.

The PAA-BA42NL indoor unit is engineered for compatibility with most ANSI-certified gas furnaces and supports Mitsubishi intelli-HEAT® technology, allowing intelligent switchover between heat pump and furnace operation. This hybrid functionality helps optimize comfort, improve energy efficiency, and reduce energy costs by automatically selecting the most effective heating source based on outdoor conditions. The indoor unit features a durable, high-quality drain pan with excellent heat tolerance and low moisture absorption for long-term reliability. Flexible multi-position installation supports horizontal and vertical configurations—including left, right, upflow, and downflow orientations—making the system adaptable to a wide range of HVAC applications and retrofit projects.

The PUZ-AK42NLHZ outdoor condenser features Mitsubishi’s renowned H2i® Hyper-Heating technology, providing 100% heating performance down to 5°F and guaranteed heating operation down to -13°F. An INVERTER-driven twin rotary compressor continuously adjusts output to match heating and cooling demand, improving comfort while reducing energy consumption and temperature fluctuations. Flash Injection technology enhances compressor performance during extreme cold weather, while the built-in base pan heater helps prevent freeze-up after defrost cycles for dependable winter operation.

Built for durability in harsh environments, the outdoor unit incorporates Blue Fin anti-corrosion coating and Seacoast Protection to guard against salt, sulfur, and airborne contaminants that can impact system performance and longevity. The system supports cooling operation from 23°F to 115°F and can operate down to 0°F in cooling mode when equipped with optional wind baffles. Despite its powerful performance, the system maintains quiet operation with outdoor sound levels of just 60 dB(A) in cooling mode and 62 dB(A) in heating mode.

The system also supports advanced smart controls and connectivity options, including Mitsubishi’s Comfort app, kumo station®, BACnet® and Modbus® interfaces, wired and wireless controllers, remote temperature sensors, and third-party thermostat integration for flexible comfort management and building automation compatibility.

General Information

System Type: Cased coil indoor unit + single-zone Hyper-Heat heat pump outdoor unit

Models: Indoor – PAA-BA42NL | Outdoor – PUZ-AK42NLHZ

Capacities: 42,000 BTU Rated Cooling (Max 44,500 | Min 17,300)

Heating Capacity: 54,000 BTU at 47°F | 38,500 BTU at 17°F | 48,000 BTU Maximum at 5°F

Room Size: Ideal for residential and light commercial spaces up to ~2,000–2,500 sq ft

Operating Modes: Heating & Cooling

ENERGY STAR®: No

Refrigerant / Factory Charge: R-454B, 11 lb 7 oz (pre-charged for 100 ft line length)

Key Features

H2i® Hyper-Heating: 100% heating performance down to 5°F with guaranteed heating operation to -13°F

INVERTER-Driven Twin Rotary Compressor: Precise heating and cooling capacity control

intelli-HEAT® Compatibility: Intelligent hybrid furnace integration capability

Flash Injection Technology: Enhanced compressor performance during extreme cold weather

Built-In Base Pan Heater: Prevents ice buildup after defrost cycles

High Airflow Output: Up to 1,660 CFM for efficient air distribution

Blue Fin & Seacoast Protection: Corrosion-resistant outdoor coil protection

Quiet Operation: Outdoor sound levels as low as 60 dB(A) cooling and 62 dB(A) heating

Flexible Installation: Multi-position indoor installation configurations

Smart Controls: Comfort app compatibility, wired/wireless remotes, BACnet®, Modbus®, and thermostat interfaces

Specifications (Rated Conditions)

Cooling Capacity: 42,000 BTU (Max 44,500 | Min 17,300) | SEER2: 17.1 | EER2: 10.8

Heating Capacity: 54,000 BTU at 47°F | 38,500 BTU at 17°F | HSPF2: 8.7

COP: 2.7 at 47°F | 1.70 at 17°F | 1.75 at 5°F | 1.58 at -13°F

Electrical: 208/230 V, 1-Ph, 60 Hz | Outdoor MCA: 35 A | MOCP: 60 A

Indoor Airflow: 936–1,660 CFM

Outdoor Sound: 60 dB(A) Cooling | 62 dB(A) Heating

Piping: Liquid 3/8 in | Gas 5/8 in | Max line length: 100 ft | Max height: 100 ft

Outdoor Operating Range: Cooling 23°F to 115°F | Heating down to -13°F

Heating Thermal Lock-Out / Restart: -22°F / -13°F

Outdoor Dimensions / Weight: 41-11/32 × 14 × 52-43/64 in | 271 lb

Indoor Dimensions / Weight: 17-1/2 × 21-3/8 × 32 in | 72.8 lb (cased coil)

Drain Connection: 3/4 in O.D.

Included Components

Indoor Unit: PAA-BA42NL cased coil indoor unit

Outdoor Unit: PUZ-AK42NLHZ Hyper-Heat heat pump condenser

Ideal For

Homes and light commercial spaces requiring dependable year-round heating and cooling in colder climates. The Mitsubishi PAA-BA42NL & PUZ-AK42NLHZ system delivers powerful Hyper-Heating performance, intelligent hybrid furnace compatibility, advanced cold-weather technology, energy-efficient inverter operation, and durable all-weather reliability for demanding environments.