Mitsubishi PAA-BA18NL & PUY-AH24NL 18,000 BTU 17.9 SEER2 Cased Coil Cooling Only System - R454B

Mitsubishi PAA-BA18NL & PUY-AH24NL: 18,000 BTU Cooling-Only Split System

The Mitsubishi PAA-BA18NL indoor cased coil paired with the PUY-AH24NL outdoor condenser delivers efficient, reliable cooling performance for residential and light commercial applications. Designed for compatibility with gas furnaces and Mitsubishi intelli-HEAT® systems, this 18,000 BTU cooling-only split system provides quiet operation, flexible installation, and dependable comfort for homes, offices, retail spaces, and retrofit HVAC projects.

The PAA-BA18NL indoor unit is engineered for compatibility with most ANSI-certified gas furnaces and supports Mitsubishi’s intelligent switchover technology for hybrid HVAC applications. The unit features a durable, high-quality drain pan with low moisture absorption and excellent heat resistance 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 layouts. With airflow up to 812 CFM, the indoor coil delivers even air distribution and consistent comfort throughout the conditioned space.

The PUY-AH24NL outdoor condenser utilizes Mitsubishi’s INVERTER-driven twin rotary compressor technology to provide efficient, precise cooling control while minimizing energy consumption. Designed for durability in harsh climates, the outdoor unit includes Blue Fin anti-corrosion coating and seacoast protection to help resist salt, sulfur, and airborne contaminants that can reduce efficiency and equipment lifespan. The system provides dependable cooling operation in outdoor temperatures up to 115°F while maintaining quiet operation with outdoor sound levels as low as 49 dB(A).

ENERGY STAR® certification and efficient inverter-driven operation help reduce utility costs while maintaining reliable cooling performance. The system also supports a full range of advanced smart control and connectivity options, including Mitsubishi’s Comfort app, kumo cloud®, wired and wireless remotes, BACnet®/Modbus® interfaces, and third-party thermostat integration for flexible comfort management.

General Information

System Type: Cased coil indoor unit + single-zone cooling-only outdoor unit
Models: Indoor – PAA-BA18NL | Outdoor – PUY-AH24NL
Capacities: 18,000 BTU Cooling (Max 18,500 | Min 9,500)
Room Size: Ideal for residential and light commercial spaces up to ~700–1,000 sq ft
Operating Modes: Cooling Only
ENERGY STAR®: Yes
Refrigerant / Factory Charge: R-454B, 7 lb 11 oz (pre-charged for 100 ft line length)

Key Features

INVERTER-Driven Compressor: Efficient, precise cooling performance
intelli-HEAT® Compatibility: Designed for hybrid furnace integration
High Airflow Output: Up to 812 CFM for even air distribution
Quiet Operation: Outdoor sound levels as low as 49 dB(A)
Flexible Installation: Multi-position horizontal or vertical installation
Blue Fin & Seacoast Protection: Corrosion-resistant outdoor coil protection
ENERGY STAR® Certified: High-efficiency operation for reduced energy costs
Smart Controls: Comfort app compatible, wired/wireless remotes, thermostat interfaces
Compact Design: Space-saving indoor and outdoor cabinet dimensions

Specifications (Rated Conditions)

Cooling Capacity: 18,000 BTU (Max 18,500 | Min 9,500) | SEER2: 17.9 | EER2: 12.8
Electrical: 208/230 V, 1-Ph, 60 Hz | MCA: 22 A | MOCP: 37 A
Indoor Airflow: 424–812 CFM
Outdoor Sound: 49 dB(A) Cooling
Piping: Liquid 3/8 in | Gas 5/8 in | Max line length: 100 ft | Max height: 100 ft
Outdoor Dimensions / Weight: 37-13/32 × 14 × 37-1/8 in | 155 lb
Indoor Dimensions / Weight: 17-9/16 × 21-7/16 × 27-1/2 in | 54 lb
Drain Connection: 3/4 in O.D.

Included Components

Indoor Unit: PAA-BA18NL cased coil indoor unit
Outdoor Unit: PUY-AH24NL cooling-only condenser

Ideal For

Residential and light commercial applications requiring efficient, reliable cooling with flexible installation and hybrid furnace compatibility. The Mitsubishi PAA-BA18NL & PUY-AH24NL system delivers quiet, energy-efficient comfort with advanced inverter technology and durable corrosion-resistant construction.