Mitsubishi Electric 42,000 BTU 17.6 SEER2 Quad Zone Wall Mounted Ductless Mini Split Heat Pump System 9+9+12+12 R454B Refrigerant | MXZ-5D42NL-MSZ-GX09NL-MSZ-GX09NL-MSZ-GX12NL-MSZ-GX12NL

Overview

This Mitsubishi multi-zone heat pump bundle pairs one MXZ-5D42NL outdoor unit with 4 wall-mounted indoor zones (2× MSZ-GX09NL (9,000 BTU wall-mounted); 2× MSZ-GX12NL (12,000 BTU wall-mounted)). The outdoor unit is rated at 40,500 BTU cooling and 45,000 BTU heating at 47°F, supporting up to 5 connected indoor units. System efficiency is listed at 19.30 SEER2 and 9.10 HSPF2 (IV) for non-ducted applications. All included units use R454B refrigerant. Connected indoor nominal capacity totals 42,000 BTU, within the outdoor unit’s stated connected-capacity range of 12,000 to 51,000 BTU.

Performance

Performance is driven by a Twin Rotary compressor and reverse cycle defrost for heat-pump operation. Outdoor airflow is listed at 2,447 CFM cooling and 2,514 CFM heating to support multi-room load changes. The outdoor unit includes blue fin heat exchanger coating, and the indoor units list Dual Barrier Coating on the heat exchanger to help maintain airflow. Each zone is served by a dedicated indoor fan with multiple speed steps, enabling independent room-level modulation. This architecture is designed for mixed-load operation where not all zones call at the same time.

Smart Features

Control is supported through the provided handheld remote controller for each indoor unit, plus additional control options including wired and wireless controllers. Wi‑Fi control is supported through the Comfort app when used with a compatible wireless interface adapter. Third‑party integration is supported through available interface accessories, including a thermostat interface option for select applications. Multi-zone zoning is inherent, with each indoor unit operating as an independent zone while the outdoor unit manages shared capacity. This setup supports scheduling and mode control by zone when the compatible app interface is used.

Comfort & Noise

Comfort features include Econo Cool airflow logic and Smart Dry Mode for humidity management with minimal over-cooling. Powerful Mode is available to quickly pull the room toward the setpoint when rapid recovery is needed. Indoor sound pressure levels are listed as low as 19 dB(A) in cooling and up to 45 dB(A) at higher fan steps on included models. The outdoor unit is listed at 58 dB(A) cooling and 59 dB(A) heating. Maximum indoor airflow for the included lineup reaches 448 CFM at cooling on the largest included indoor model.

Use Case Fit

This bundle is a fit for residential homes, light commercial suites, and multi-family units that need multiple independently controlled rooms from one outdoor platform. With support for 2 to 5 indoor units, it can cover a mix of bedrooms, living areas, and dedicated spaces using matched indoor sizes. Wall-mounted indoor units suit retrofit projects where ductwork is limited or where room-level zoning is a priority. The outdoor operating ranges listed include cooling down to 14°F intake air and heating down to 6°F intake air, supporting shoulder-season and cold-weather operation within the stated limits. Capacity varies based on the number of indoor units operating and the connected configuration, which supports common diversity-driven designs.

Value & Reliability

Serviceability and durability are supported by coil protection features such as Blue Fin coating outdoors and Dual Barrier Coating indoors. The outdoor unit is factory charged with R454B (pre-charged amount listed at 6 lb 3 oz) and supports up to 262 ft of total piping for flexible layouts. Farthest piping length is listed at 82 ft, with up to 49 ft of height difference between outdoor and indoor units (ODU above or below). Reverse-cycle defrost is specified for winter performance, and an optional base pan heater is listed for accessory configuration. These specifications help wholesalers and contractors plan multi-zone installations with clear electrical and piping constraints.

Summary Wrap-Up

For buyers comparing multi-zone mini-splits, this configuration delivers 4 independent zones on one MXZ-5D42NL outdoor unit with rated efficiency figures for non-ducted use. Included indoor units cover a range of nominal capacities to match typical room loads while maintaining a consistent wall-mounted form factor. Coil protection features, app-enabled control pathways, and multi-speed airflow provide a balanced combination of comfort and maintainability. With long piping allowances and support for capacity diversity, it fits many retrofit and new construction layouts. This makes it a practical bundle for direct-to-consumer projects and trade buyers needing a matched multi-zone package.

Key Features

• 19.30 SEER2 Efficiency: Supports energy-focused cooling in non-ducted applications with a listed 9.10 HSPF2 (IV) heating efficiency.
• Twin Rotary Compressor: Delivers variable-capacity operation suited to multi-zone load changes while maintaining steady room temperatures.
• 2–5 Zone Connection: Supports 2 to 5 indoor units, and this bundle includes 4 wall-mounted zones sized for the listed rooms.
• R454B Refrigerant System: Uses R454B across outdoor and indoor units for a matched refrigerant platform.
• Coil Protection Coatings: Includes Blue Fin coating on the outdoor heat exchanger and Dual Barrier Coating on indoor heat exchangers to help reduce contaminant buildup.
• Control Options: Includes handheld remotes and supports additional wired/wireless controller and app-based control pathways using compatible accessories.
• Piping Flexibility: Supports up to 262 ft total piping and up to 49 ft vertical separation to accommodate complex layouts.