Mitsubishi SEZ-KD12NA4R1
Mitsubishi SEZ-KD12NA4R1
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Mitsubishi 12,000 BTU Ducted Horizontal Heat Pump Air Handler



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Mitsubishi 12,000 BTU Ducted Horizontal Heat Pump Air Handler
Mitsubishi 12,000 BTU Ducted Horizontal Heat Pump Air Handler
Model: SEZ-KD12NA4R1
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Mitsubishi Mini-Splits 5%
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Offer Ends 07/31/24

Recommended Accessories

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Expert Recommended Accessories Selected by Ken, our Expert
Required Accessories 9
These accessories are required to properly setup/install this product.
Optional Accessories 10


    For over 50 years, Mitsubishi has remained at the forefront of the mini split industry thanks to their dedication to providing efficient, user-friendly comfort solutions. The SEZ-KD12NA4R1 is a concealed duct heat pump mini split indoor unit for use in single zone and multi-zone systems. This unit is easily hidden in short-run ducting and operates quietly, making it the perfect choice for unobtrusive zoned comfort. With the SEZ-KD12NA4R1, a small air register is the only evidence of that a powerful and efficient mini split is servicing your room. With multiple operating modes and multiple fan speeds, this unit fits the needs of nearly any room. Whether you are designing a primary heating and cooling system or supplementing an existing one, the SEZ-KD12NA4R1 is an excellent addition.
  • Hot-Start
  • Mitsubishi's hot start technology prevents cold drafts by delaying fan operation until the heat exchanger has warmed up.
  • Dehumidification
  • When the indoor unit runs in dry mode, the coil's temperature stays just below the dew point of the return air, removing unwanted moisture. This improves comfort and reduces the chance of mold growth and other property damage in the conditioned space.
  • Condensate Removal System
  • The SEZ-KD12NA4R1.TH contains an internal drain mechanism capable of lifting condensate 21-11/16". This simplifies installation and prevents condensate overflow, which can damage or destroy your property.
  • Product Compatible With
  • Mitsubishi MXZ-2B20NA-1 Mini Split Outdoor Condenser
  • Mitsubishi MXZ-3C24NA Mini-Split Outdoor Condenser
  • Mitsubishi MXZ-3C30NA Mini Split Outdoor Condenser
  • Mitsubishi MXZ-4C36NA Mini Split Outdoor Condenser
  • Mitsubishi MXZ-5C42NA Mini Split Outdoor Condenser
  • Mitsubishi MXZ-8C48NA Mini Split Outdoor Condenser
  • Product Note
    • This product requires a compatible mini split outdoor condenser and the following accessories for indoor unit installation:
    • Line Set - This double insulated tubing transfers refrigerant efficiently between your outdoor condenser and indoor units.
    • Drain Tubing - Drain tubing facilitates the reliable and effective removal of condensate from your system. It connects your indoor units to drain locations of your choosing..
    • Disconnect Box & Electrical Whip Kit - The Disconnect Box & Whip Kit provides a safe and simple way to connect your outdoor condenser to your fuse box.
    • Connecting Wire - This durable, insulated wire provides power to your indoor units from your outdoor condenser.
    • Outdoor Condenser Plastic Pad (Optional) - This pad provides an even surface, free of debris, on which to place your outdoor condenser.
    • Wall Bracket (Optional) - A simple and sturdy way to mount your outdoor condenser off of the ground.
    Adding these accessories to your order will provide a complete, ready-to-install mini split system.


specs product image PID-30665
Product Category
Mini Split System Components
Additional Model Numbers


General Information
Concealed Duct
Product Line
Product Category
Mini Split System Components
Operating Mode Learn More
Operating Mode
Some products are only capable of cooling, while others can either heat or cool a space. Some products heat via "heat pump" technology while others use electric heating elements. Learn More
Heating and Cooling
Multi-Zone Compatible
Refrigerant Type
Indoor Unit Size(s) Learn More
Indoor Unit Size(s)
Mini split systems can have one or more indoor units connected to a single outdoor unit. Indoor Unit Size(s) specifies what indoor unit sizes are used in a system. We have combined 6k and 7k indoor units to enhance searchability.
Installation Location
Cooling BTU
Cooling Capacity
11500 BTU
Moisture Removal
2.4 Pints/Hour
Maximum Air Flow
388 CFM
Minimum Air Flow
247 CFM
Minimum Sound Level
23 dB
Maximum Sound Level Learn More
Maximum Sound Level
Sound levels are measured in decibels (dB). The lower the decibel rating, the less noise the product makes. As an example, a ticking watch is 20 dB while on the other end of the scale, a lawn mower is around 90 dB. Learn More
33 dB
Electrical Data
60 Hz
Gas Connection Size
3/8 Inch
Liquid Connection Size
1/4 Inch
Product Height
7 7/8 Inches
Product Width
39 Inches
Product Depth
27 9/16 Inches
Product Weight
60 Pounds
Shipping Weight
70 Pounds
ETL Listed
Warranty Information
Parts Warranty Learn More
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
5 Years


Mitsubishi SEZ-KD12NA4R1 Reviews & Ratings

Product Q&A

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Product Questions Answered by Ken, the eComfort Product Expert
Can you create multiple duct runs from one concealed unit?
from Missouri 
May 25, 2016

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Mitsubishi 12,000 BTU Ducted Horizontal Heat Pump Air Handler
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