Description
SUZ-AA12NL-SLZ-AF12NL is a Mitsubishi Electric single-zone heat pump system using a four-way ceiling-recessed cassette indoor unit. The SLZ-AF cassette keeps the equipment out of sight while delivering comfort from above. The SUZ-AA outdoor unit is matched one-to-one, which keeps performance clear and selection simple. This NL generation uses R-454B refrigerant as part of the A2L low-GWP product direction. Four-way air delivery helps spread comfort across the room rather than concentrating it in one spot. Customers like this style because it feels built-in and premium without taking up wall space. It’s a practical choice for bedrooms, offices, and common areas where aesthetics matter.
Rated cooling capacity is 12,000 BTU/h, with a listed maximum of 12,000 BTU/h. Minimum cooling capacity is listed at 3,000 BTU/h to help reduce short cycling when loads are light. Moisture removal is listed at 1.8 pints per hour, supporting a more comfortable indoor feel in humid weather. Rated cooling power input is 960 W, which is a clean benchmark for energy comparison. Sensible heat factor is listed at 0.84, balancing temperature reduction with humidity control. Variable-capacity operation is built to hold setpoint more steadily than traditional single-stage systems. That “steady and quiet” feel is what most buyers are actually chasing.
Rated heating capacity at 47°F is 15,000 BTU/h, with a listed maximum of 15,000 BTU/h. Minimum heating capacity at 47°F is listed at 4,900 BTU/h for smoother performance in mild heating conditions. Heating capacity at 17°F is listed at 9,800 BTU/h for a real cold-weather reference. Heating at 5°F lists a maximum capacity of 7,900 BTU/h to support continued output deeper into winter. COP at 47°F is listed at 3.2, supporting an efficiency-first heat pump story. HSPF2 is listed at 9.7, which helps frame seasonal heating value. For buyers who want efficient electric heating with a clean ceiling look, this pairing delivers.
Airflow rate at cooling, dry is listed at 230, 280, or 335 CFM depending on fan speed. The cassette’s four discharge vanes support flexible airflow direction for different room layouts. Indoor sound pressure levels are listed at 25, 30, or 34 dB(A) based on fan speed selection. Outdoor sound pressure is listed at 49 dB(A) in cooling and 51 dB(A) in heating. SEER2 is listed at 20.3 and EER2 is listed at 12.5 for direct efficiency comparison. The result is comfort that’s evenly distributed and not visually intrusive. That combination is easy to sell because it solves comfort and design at the same time.
Electrical is listed at 208/230V single-phase 60 Hz, which is standard for this class. Recommended fuse or breaker size is listed at 15 A for straightforward planning. The ceiling cassette format is a strong option when wall space is limited or the room layout is sensitive. It’s also a clean choice for renovations where you want the comfort upgrade to look intentional. The published efficiency and sound numbers help customers feel confident buying online. When the spec story reads clear, customers stay engaged and move faster toward checkout. If you want a 12k ceiling cassette pairing with verified performance, this is a strong pick.
Key Features
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Four-way ceiling cassette style: Ceiling-recessed indoor unit with four-way comfort delivery.
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R-454B A2L low-GWP platform: NL generation refrigerant type listed as R-454B.
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Cooling performance: 12,000 BTU/h rated cooling, 3,000 BTU/h minimum, 1.8 pints/h moisture removal.
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Heating performance: 15,000 BTU/h rated at 47°F, 9,800 BTU/h at 17°F, 7,900 BTU/h max at 5°F, COP 3.2 at 47°F.
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Efficiency ratings: 20.3 SEER2, 9.7 HSPF2, 12.5 EER2.
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Airflow and sound context: 230/280/335 CFM (cooling, dry) and 25/30/34 dB(A) indoor sound levels by fan speed.
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Purchase note: Grille is sold separately.
Replaces Discontinued Models
- SUZ-AA12NL replaces: MUF12EN, MUF12EN2, SUZ-KA12NA, SUZ-KA12NA2, SUZ-KA12NAR1
- SLZ-AF12NL replaces: SLZ-KA12NA, SLZ-KA12NAR1, SLZ-KF12NA, SLZ-KF12NA1
Replacement matches are based on unit type, capacity and features. Verify line set, electrical supply and controls before ordering. See the discontinued Mitsubishi model cross-reference for details and original manuals.
White Paper
- Mitsubishi SLZ-AF12NL + SUZ-AA12NL System Spec Sheet
- Mitsubishi SLZ-AF12NL Spec Sheet
- Mitsubishi SLZ-AF Series Installation Manual (Part 1 of 4)
- Mitsubishi SLZ-AF Series Installation Manual (Part 2 of 4)
- Mitsubishi SLZ-AF Series Installation Manual (Part 3 of 4)
- Mitsubishi SLZ-AF Series Installation Manual (Part 4 of 4)
- Mitsubishi SUZ-AA Series Operation Manual (Part 1 of 2)
- Mitsubishi SUZ-AA Series Operation Manual (Part 2 of 2)
- Mitsubishi SLZ-AF Series Service Manual (Part 1 of 2)
- Mitsubishi SLZ-AF Series Service Manual (Part 2 of 2)
- Mitsubishi SUZ-AA Series Installation Manual
- Mitsubishi SUZ-AA Series Operation Manual
- Mitsubishi SUZ-AA Series Service Manual
