{"product_id":"lg-knmkb121a","title":"LG KNMKB121A Low Static Ducted Indoor Unit with 12000 BTU Cooling Capacity, 13800 BTU Heating Capacity and Washable Filter in Silver","description":"\u003cp style=\"margin-bottom: 0px\"\u003eLG's devotion to providing efficient ductless solutions can be seen across the Multi F line of indoor units. The KNMKB121A is a mini split indoor unit designed for installation in short-run ducting with low static pressures. Concealed duct indoor units mean that you can add mini split zones with no visible indoor units. A small air register is the only clue that a mini split is providing effective heating and cooling to your space.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eAHRI Certified \u003c\/li\u003e\n\u003cli\u003eSleep Mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eEnhanced Connectivity\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eLG's new R-32 mini split units require a 5-conductor cable (Not Included) instead of the standard 4-conductor, improving communication reliability and enabling a new leak detection feature.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQuiet Design\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eThe unit can operate at volumes as low as 27 dB thanks to its advanced fan motor. The brushless direct current motor reduces electrical and mechanical sound while providing powerful air movement.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eAutomated Operation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eAuto operation mode continually compares your zone's current and desired temperatures and uses that data to intelligently adjust the unit's fan speed and refrigerant flow to provide optimal comfort.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eCondensate Protection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eCondensate overflow can damage your indoor unit and your home. An internal condensate pump with 27.5\" of lift protects the unit  through reliable, effective condensate removal.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eDehumidify\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eLG's indoor units include a dehumidifying operation mode. In this mode, the unit's internal sensors monitor temperature and modify the set point and fan speed to remove moisture from the air.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eImproved Air Quality\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eThe unit  features an anti-fungal filter to keep your air clean. This filter captures contaminants like dust and bacteria, and it is washable to ensure long term air quality.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eHot-Start\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen the Hot-Start function is enabled, the unit's fan will not engage until the outdoor condenser has had the opportunity to warm the indoor coil. This prevents the unit from blowing cold air during heating operations.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eMatching Products\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eMatching 18000 BTU Multi-Zone Outdoor Unit KUMXB181A\u003c\/li\u003e\n\u003cli\u003eMatching 24000 BTU Multi-Zone Outdoor Unit KUMXB241A\u003c\/li\u003e\n\u003cli\u003eMatching 30000 BTU Multi-Zone Outdoor Unit KUMXB301A\u003c\/li\u003e\n\u003cli\u003eMatching 36000 BTU Multi-Zone Outdoor Unit KUMXB361A\u003c\/li\u003e\n\u003cli\u003eMatching 48000 BTU Multi-Zone Outdoor Unit KUMXB481A\u003c\/li\u003e\n\u003cli\u003eMatching 54000 BTU Multi-Zone Outdoor Unit KUMXB541A\u003c\/li\u003e\n\u003cli\u003eMatching 60000 BTU Multi-Zone Outdoor Unit KUMXB601A\u003c\/li\u003e\n\u003cli\u003eMatching 18000 BTU LGRED Multi-Zone Outdoor Unit KUMXA181A\u003c\/li\u003e\n\u003cli\u003eMatching 24000 BTU LGRED Multi-Zone Outdoor Unit KUMXA241A\u003c\/li\u003e\n\u003cli\u003eMatching 30000 BTU LGRED Multi-Zone Outdoor Unit KUMXA301A\u003c\/li\u003e\n\u003cli\u003eMatching 36000 BTU LGRED Multi-Zone Outdoor Unit KUMXA361A\u003c\/li\u003e\n\u003cli\u003eMatching 42000 BTU LGRED Multi-Zone Outdoor Unit KUMXA421A\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eMatching 48000 BTU LGRED Multi-Zone Outdoor Unit KUMXA481A\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Buy LG KNMKB121A Low Static Ducted Indoor Unit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eSpace-Saving Design: Its slim profile allows for installation in tight ceiling spaces, delivering both heating and cooling without exposing bulky indoor units.\u003c\/li\u003e\n\u003cli\u003eShort Duct Runs: Designed specifically for low static pressure applications, this unit excels in short duct configurations where extended runs aren’t feasible.\u003c\/li\u003e\n\u003cli\u003eDiscreet Aesthetics: With only a small air register visible, the system maintains a clean, unobtrusive appearance in any room.\u003c\/li\u003e\n\u003cli\u003eQuiet Operation: A brushless DC motor enables whisper-quiet performance\u003c\/li\u003e\n\u003cli\u003eFlexible Installation: Rear or bottom air intake options allow for adaptable installation based on your space and layout needs.\u003c\/li\u003e\n\u003cli\u003eEnergy Efficiency: Features like auto operation and Sleep Mode help optimize comfort while reducing overall energy consumption.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eConcealed Duct Advantage: Unlike wall-mounted systems, this concealed unit offers central system comfort without compromising interior aesthetics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: What is the LG KNMKB121A?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: The LG KNMKB121A is a 12,000 BTU concealed duct indoor unit designed for use in a multi-zone ductless mini-split heat pump system.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eIt’s a low-static pressure unit suitable for installations where only minimal ducting is needed.\u003c\/li\u003e\n\u003cli\u003eAs a concealed duct unit, it is installed inside a ceiling or wall—only the air register is visible in the room.\u003c\/li\u003e\n\u003cli\u003eIt must be connected to a compatible LG multi-zone outdoor condenser to operate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: What accessories are required for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: Several components are needed to complete the system, as the KNMKB121A is not a standalone unit.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eOutdoor condenser unit: Must be an LG-compatible multi-zone model.\u003c\/li\u003e\n\u003cli\u003eRemote control \u0026amp; cable: Typically a wired controller like the PREMTC00U, along with an extension cable.\u003c\/li\u003e\n\u003cli\u003eLine set: Double-insulated refrigerant tubing connects indoor and outdoor units.\u003c\/li\u003e\n\u003cli\u003eConnecting wire: A 5-conductor communication cable is required for R-32 refrigerant systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: Why is my unit running but not cooling properly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: This is often caused by airflow restrictions, most commonly from a dirty air filter.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eCheck the air filter for dust or blockage.\u003c\/li\u003e\n\u003cli\u003eClean or replace the filter as needed.\u003c\/li\u003e\n\u003cli\u003eEnsure that vents and ductwork are unobstructed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: Why won’t the unit start at all?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: Power issues or seasonal settings may be preventing the unit from starting.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eCheck if the circuit breaker has tripped and reset it if necessary.\u003c\/li\u003e\n\u003cli\u003eIf using the unit in winter, ensure proper winterization procedures were followed.\u003c\/li\u003e\n\u003cli\u003eConfirm that the outdoor condenser is receiving power and communication from the indoor unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: What does the error code CH05 mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: CH05 typically indicates a communication error between the indoor and outdoor units.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eInspect the wiring between the indoor and outdoor units.\u003c\/li\u003e\n\u003cli\u003eCheck that the circuit breaker for the outdoor unit is not tripped.\u003c\/li\u003e\n\u003cli\u003eA professional technician may be required for further diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: What does the error code CH61 mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: CH61 signals that the outdoor unit’s heat exchanger may be overheating.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eEnsure the area around the outdoor condenser is well-ventilated.\u003c\/li\u003e\n\u003cli\u003eRemove any debris or obstructions near the unit.\u003c\/li\u003e\n\u003cli\u003eIf the issue persists, consult an HVAC professional.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eQ: Why is my unit making unusual noises?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003eA: Some sounds are part of normal operation, but unfamiliar noises should be investigated.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eListen closely to identify the type of noise (e.g., clicking, buzzing, gurgling).\u003c\/li\u003e\n\u003cli\u003eRefer to the LG support website, which includes audio samples of normal and abnormal sounds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eContact LG support or an HVAC technician if you're unsure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003ePros and Cons for LG KNMKB121A Low Static Ducted Indoor Unit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eDiscreet installation: Because the unit is concealed within a wall or ceiling, it provides heating and cooling with only small, visible air registers, preserving the look of your interior space.\u003c\/li\u003e\n\u003cli\u003eQuiet operation: The KNMKB121A operates at sound levels as low as 27 dB, comparable to a whisper. Its brushless direct current (BLDC) fan motor helps reduce both electrical and mechanical noise.\u003c\/li\u003e\n\u003cli\u003eHigh efficiency: As part of an inverter-driven mini-split system, it precisely regulates the refrigerant flow and fan speed, leading to consistent temperatures and lower energy consumption compared to traditional systems.\u003c\/li\u003e\n\u003cli\u003eSpace-saving design: With a slim profile, the unit can be installed in tight ceiling spaces, making it an ideal solution for projects with limited installation space.\u003c\/li\u003e\n\u003cli\u003eConvenience features: The unit includes several automated functions, such as auto operation mode to maintain temperature, a sleep mode for energy savings, and a built-in condensate pump with 27.5 inches of lift to prevent overflow.\u003c\/li\u003e\n\u003cli\u003eImproved air quality: It comes with a washable anti-fungal filter that captures dust and bacteria, contributing to cleaner air.\u003c\/li\u003e\n\u003cli\u003eReliable heating: The \"Hot-Start\" feature prevents the unit from blowing cold air during heating cycles by waiting for the coil to warm up before the fan engages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 0px\"\u003e\n\u003cli\u003eRequires professional installation: Like all mini-split systems, the low static duct unit needs professional installation, which involves specialized training and tools for handling the refrigerant and electrical connections. It is not a DIY-friendly project.\u003c\/li\u003e\n\u003cli\u003eLimited static pressure: As a low-static model, it is optimized for short duct runs. Using it with longer, more complex ductwork can significantly reduce its performance and efficiency, requiring a mid-static or high-static unit instead.\u003c\/li\u003e\n\u003cli\u003eHigher installation costs: The installation cost is generally higher than that of a standard wall-mounted mini-split because of the labor involved in running ductwork and concealing the unit.\u003c\/li\u003e\n\u003cli\u003eBrand support issues: Some users have reported negative experiences with LG's technical support and warranty claims for their mini-split products.\u003c\/li\u003e\n\u003cli\u003eDependency on other components: The indoor unit requires a compatible outdoor condenser, a specific 5-conductor communication cable, and a separate remote controller for operation. These items are sold separately and must be properly matched.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0px\"\u003e\u003cstrong\u003eConclusion\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe LG KNMKB121A is an excellent choice for homeowners or small commercial applications that prioritize aesthetics and quiet operation. Its concealed design and low sound levels offer a superior comfort experience compared to visible wall-mounted mini-split heads or noisy traditional HVAC units. It provides high efficiency and features like a dehumidifier and washable filter that add to its value. However, its suitability is highly dependent on the ductwork requirements of the installation. It is specifically engineered for short, simple duct runs, and attempting to use it for a more extensive duct system will result in poor performance. The requirement for professional installation and matching with a compatible condenser and accessories also adds to the complexity and overall cost. For those with a straightforward application and a desire for a discreet, quiet system, the LG KNMKB121A is a strong contender, provided you are aware of the installation specifics and potential for limited customer support.\u003c\/p\u003e\n","brand":"LG","offers":[{"title":"KNMKB121A","offer_id":47009048035584,"sku":"KNMKB121A","price":1260.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0740\/2287\/9488\/files\/KNMKB121A_p173159.jpg?v=1757715505","url":"https:\/\/secure.shopappliances.com\/products\/lg-knmkb121a","provider":"Shop Appliances","version":"1.0","type":"link"}