The Mitsubishi 42,000 BTU multi-zone outdoor heat pump (MXZ-5C42NA2-U1) is an extremely efficient heating and cooling option that can handle up to five zones.
Mitsubishi's current 42,000 BTU outdoor heat pump model is the MXZ-5C42NA2. This specific outdoor unit of the MXZ-5C42NA2 is part of Mitsubishi's M-Series, catering to residential applications.
Features
Line Set - When hooking up indoor units to the MXZ-5C42NA, you'll need refrigerant lines. There can be three different combinations for this outdoor unit: 1/4" & 3/8" for 6,000-12,000 BTU units, 1/4" & 1/2' for 15,000-18,000 BTU units, and 3/8" & 5/8" for 24,000 BTU units. Our line-sets kits come in different lengths; however, you can cut the copper pipes to fit your application.
Disconnect Box & Electrical Whip Kit - The disconnect & whip kit comes in each installation kit. It provides a safe and simple way to connect your outdoor condenser to your homes' electrical panel
Outdoor Condenser Plastic Pad (Optional) - This pad provides an even surface, free of debris, on which to place your outdoor condenser. It's included with multi-zone systems orders.
Wall Bracket (Optional) - A simple and sturdy way to mount your outdoor condensing unit off of the ground and attached to your home. It's included with multi-zone systems orders.
Port Adapters (Optional) - Port adapters are sometimes necessary when connecting multiple indoor units to an outdoor unit. See installation manual to see when these items are necessary.
3.5-Ton Inverter Condenser
M-Series
Cooling & Heating
NO
5
42,000 BTU
Dimensions
41 9/32" Height
37 13/32" Width
13" Depth
Weight : 189 lbs
Noise Level: 56-58 decibals
Includes
MXZ-5C42NA*
Performance
43,000 BTU
53,600 BTU
19.7
10.30
5 F
14 F
up to 1750 sq ft
What our Experts Think
Powerful Multi‑Zone Outdoor System: The Mitsubishi MXZ‑5C42NA 42,000 BTU 5‑Zone Heat Pump Outdoor Unit is a robust choice for multi‑room climate control, capable of powering up to five indoor units for personalized heating and cooling across several zones.
Strong Seasonal Efficiency: With high SEER2 (up to ~19.7) and HSPF2 (~10.3) ratings, it delivers efficient performance that helps reduce energy costs compared with traditional systems.
Balanced Cooling & Heating Output: Rated around 40,500 BTU cooling and 45,000 BTU heating with capacity peaks up to about 43,000 BTU (cool) and 53,600 BTU (heat) depending on indoor/outdoor conditions, offering reliable comfort year‑round.
Flexible Indoor Pairing: Designed for multi‑zone setups, it pairs with a range of indoor unit types (wall mounts, cassettes, ducted or floor units) giving you flexibility to tailor each zone’s comfort level.
Quiet & Durable Operation: Built with variable‑speed inverter compressor technology and a low‑noise outdoor footprint (~56–58 dB), it balances performance with quieter operation in residential settings.
Reliable Protection Features: Includes built‑in safeguards like high‑pressure protection, thermal protection, and automatic restart, enhancing system durability and reliability.
Long Line Length Support: Allows extended piping lengths and individual line runs (up to ~82 ft per indoor unit), offering flexibility for complex installations.
Classic R410A System: Uses tried‑and‑true R410A refrigerant, suitable for existing installations where R410A units are being replaced or expanded — though newer R454B systems are now common for new builds.
Ideal for Zoned Comfort: A top pick when you want customized climate control across multiple rooms or zones with one outdoor unit managing efficiency and performance for the entire system
Q&A
Q: What kind of unit is this? A: The Mitsubishi MXZ‑5C42NA is a multi‑zone heat pump outdoor condenser designed for ductless mini‑split systems, supporting up to five indoor units for customized zoned comfort.
Q: What capacity does it deliver? A: It provides a 42,000 BTU nominal capacity, with cooling up to about 43,000 BTU and heating up to about 53,600 BTU depending on indoor units used.
Q: What refrigerant does it use? A: Uses R410A refrigerant, a widely supported refrigerant in mini‑split systems for efficient heat transfer.
Q: How energy efficient is it? A: Offers high efficiency with up to ~19.7 SEER2, EER2 ~9.2, and HSPF2 ~10.3, helping reduce energy consumption.
Q: What climates and conditions does it operate in? A: Designed for year‑round cooling and heating, functioning in a broad range of outdoor temperatures with quiet operation around 56–58 dB(A).
Q: What installation flexibility does it offer? A: Works with various compatible indoor units (wall–mounted, ceiling cassette, ducted, etc.) and supports flexible piping lengths for multi‑zone configurations.
Q: What durability features are included? A: Includes anti‑corrosion Blue Fin coating and protective circuitry such as high‑pressure and compressor thermal protection for long‑term reliability.
Q: What are typical electrical requirements? A: Operates on 208/230 V single‑phase power with recommended breaker and fuse sizes for safe, standard HVAC installation.
Maintenance Tips
Multi‑zone performance: Supports up to 5 indoor units for independent comfort zones from one outdoor heat pump.
Efficient cooling & heating: Rated ~40,500 BTU cooling (up to ~43,000 BTU max) and ~45,000 BTU heating at 47 °F; heating remains substantial at lower temps.
Variable‑speed INVERTER compressor: Smooth modulation for improved efficiency and reduced cycling.
Modern R‑410A refrigerant: Standard refrigerant for balanced efficiency and reliability.
Energy performance: SEER2 up to ~19.7 and HSPF2 up to ~10.3, offering solid seasonal efficiency.
Quiet operation: Outdoor sound as low as ~56–58 dB(A).
Wide operating range: Effective cooling and heating across typical seasonal temperatures.
Durable build: Robust outdoor design with standard protections (high‑pressure switch, thermal protection).
Standard electrical: 208/230 V, single‑phase, 60 Hz with recommended ~40 A breaker.
Flexible piping: Supports line lengths up to ~262 ft total, ~82 ft per indoor unit for installation flexibility.
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