{"product_id":"msz-fx12nl-mitsubishi-12-000-btu-wall-mounted-unit","title":"Mitsubishi MSZ-FX12NL 12,000 BTU Wall Mounted Indoor Unit  - R454B - MSZFX12NL","description":"\u003ch2 data-end=\"70\" data-start=\"0\"\u003eMitsubishi MSZ-FX12NL 12,000 BTU Wall Mounted Indoor Unit  - R454B - MSZFX12NL\u003c\/h2\u003e\n\u003cp data-end=\"250\" data-start=\"72\"\u003eDeliver powerful, energy-efficient comfort with the Mitsubishi MSZ‑FX12NL, a sleek FX-Series wall-mounted indoor unit designed for precise climate control in medium-sized spaces.\u003c\/p\u003e\n\u003cp data-end=\"455\" data-start=\"252\"\u003e\u003cstrong data-end=\"283\" data-start=\"252\"\u003eModern, Space-Saving Design\u003c\/strong\u003e\u003cbr data-end=\"286\" data-start=\"283\"\u003eThe MSZ‑FX12NL’s slim profile and contemporary styling make it an unobtrusive addition to any room, ideal for living rooms, larger bedrooms, or offices up to ~500 sq ft.\u003c\/p\u003e\n\u003cp data-end=\"739\" data-start=\"457\"\u003e\u003cstrong data-end=\"487\" data-start=\"457\"\u003eQuiet, Efficient Operation\u003c\/strong\u003e\u003cbr data-end=\"490\" data-start=\"487\"\u003eOperating at sound levels as low as 25 dB(A), this unit combines Mitsubishi’s advanced INVERTER technology with a 12,000 BTU cooling capacity and up to 15,000 BTU heating (paired with a compatible outdoor unit) for consistent, energy-saving comfort.\u003c\/p\u003e\n\u003cp data-end=\"992\" data-start=\"741\"\u003e\u003cstrong data-end=\"782\" data-start=\"741\"\u003eEnhanced Air Quality \u0026amp; Smart Features\u003c\/strong\u003e\u003cbr data-end=\"785\" data-start=\"782\"\u003eEquipped with advanced filtration and Dual Barrier Coating to reduce allergens and dirt, the MSZ‑FX12NL supports optional Wi-Fi control via the Mitsubishi Comfort Control app for convenient remote operation.\u003c\/p\u003e\n\u003cp data-end=\"1206\" data-start=\"994\"\u003e\u003cstrong data-end=\"1021\" data-start=\"994\"\u003eSingle-Zone Flexibility\u003c\/strong\u003e\u003cbr data-end=\"1024\" data-start=\"1021\"\u003ePairs with MUZ or SUZ-FX outdoor units in single-zone applications. Features multiple comfort modes including Smart Dry+, Powerful, and Econo Cool to optimize performance year-round.\u003c\/p\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"1419\" data-start=\"1208\"\u003e\u003cstrong data-end=\"1241\" data-start=\"1208\"\u003eTrusted Mitsubishi Durability\u003c\/strong\u003e\u003cbr data-end=\"1244\" data-start=\"1241\"\u003eBacked by Mitsubishi’s industry-leading 10-year parts warranty when installed and registered by a licensed contractor, the MSZ‑FX12NL offers lasting comfort and peace of mind.\u003c\/p\u003e\n\u003ch5 data-end=\"736\" data-start=\"624\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eWhat our Experts Think\u003c\/span\u003e\u003c\/h5\u003e\n\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-69aa6530-87bc-8320-b8fc-c39887a23b7f-6\" data-testid=\"conversation-turn-36\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"475936fc-3c41-441c-97a8-fe2f0f666afb\" dir=\"auto\" data-message-model-slug=\"gpt-5-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cul data-start=\"27\" data-end=\"1846\"\u003e\n\u003cli data-section-id=\"e700k6\" data-start=\"27\" data-end=\"322\"\u003e\n\u003cp data-start=\"29\" data-end=\"322\"\u003e\u003cstrong data-start=\"29\" data-end=\"64\"\u003eEfficient Wall‑Mounted Comfort:\u003c\/strong\u003e The \u003cstrong data-start=\"69\" data-end=\"130\"\u003eMitsubishi MSZ‑FX12NL 12,000 BTU Wall Mounted Indoor Unit\u003c\/strong\u003e delivers reliable \u003cstrong data-start=\"149\" data-end=\"184\" data-is-only-node=\"\"\u003eheating and cooling performance\u003c\/strong\u003e with inverter‑driven airflow and precise climate control for single‑zone spaces up to ~500 sq ft. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1e3dyi2\" data-start=\"323\" data-end=\"520\"\u003e\n\u003cp data-start=\"325\" data-end=\"520\"\u003e\u003cstrong data-start=\"325\" data-end=\"354\"\u003eAdvanced Climate Sensing:\u003c\/strong\u003e Built‑in \u003cstrong data-start=\"364\" data-end=\"384\"\u003e3D i‑see Sensor®\u003c\/strong\u003e scans room temperature and occupancy to adjust airflow and balance comfort with energy savings. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"i41b2w\" data-start=\"521\" data-end=\"730\"\u003e\n\u003cp data-start=\"523\" data-end=\"730\"\u003e\u003cstrong data-start=\"523\" data-end=\"554\"\u003eSmart Airflow \u0026amp; Filtration:\u003c\/strong\u003e Dual vane directional airflow and \u003cstrong data-start=\"589\" data-end=\"617\"\u003eTriple Action Filtration\u003c\/strong\u003e reduce dust, odors, and airborne particles while optimizing circulation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1hvn167\" data-start=\"731\" data-end=\"905\"\u003e\n\u003cp data-start=\"733\" data-end=\"905\"\u003e\u003cstrong data-start=\"733\" data-end=\"760\"\u003eEnergy‑Saving Features:\u003c\/strong\u003e Multiple fan speeds and \u003cstrong data-start=\"785\" data-end=\"816\"\u003eSmart Dry+\/Econo Cool modes\u003c\/strong\u003e help maintain comfort while reducing energy use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"84apos\" data-start=\"906\" data-end=\"1075\"\u003e\n\u003cp data-start=\"908\" data-end=\"1075\"\u003e\u003cstrong data-start=\"908\" data-end=\"931\"\u003eQuiet, Slim Design:\u003c\/strong\u003e Whisper‑quiet operation and a sleek wall‑mounted profile fit modern interiors without bulk‑y footprint. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1skzcy5\" data-start=\"1076\" data-end=\"1269\"\u003e\n\u003cp data-start=\"1078\" data-end=\"1269\"\u003e\u003cstrong data-start=\"1078\" data-end=\"1107\"\u003eFlexible Control Options:\u003c\/strong\u003e Includes remote control and pairs with Wi‑Fi via Mitsubishi’s \u003cstrong data-start=\"1170\" data-end=\"1185\"\u003eComfort app\u003c\/strong\u003e for easy scheduling and remote adjustments. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1pv2yy3\" data-start=\"1270\" data-end=\"1447\"\u003e\n\u003cp data-start=\"1272\" data-end=\"1447\"\u003e\u003cstrong data-start=\"1272\" data-end=\"1304\"\u003eDurable and Low‑Maintenance:\u003c\/strong\u003e Dual Barrier Coating and Fusion protect against grime buildup for cleaner operation and easier upkeep. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1ftp1pt\" data-start=\"1448\" data-end=\"1651\"\u003e\n\u003cp data-start=\"1450\" data-end=\"1651\"\u003e\u003cstrong data-start=\"1450\" data-end=\"1483\"\u003eEfficient Refrigerant Choice:\u003c\/strong\u003e Designed for use with eco‑friendly \u003cstrong data-start=\"1519\" data-end=\"1540\"\u003eR454B refrigerant\u003c\/strong\u003e, aiding reduced environmental impact without compromising performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"fy2ri9\" data-start=\"1652\" data-end=\"1846\"\u003e\n\u003cp data-start=\"1654\" data-end=\"1846\"\u003e\u003cstrong data-start=\"1654\" data-end=\"1684\"\u003eIdeal for Homes \u0026amp; Offices:\u003c\/strong\u003e A strong pick for residential and light commercial spaces where \u003cstrong data-start=\"1749\" data-end=\"1793\"\u003equiet, efficient, and smart zone comfort\u003c\/strong\u003e is a priority. \u003cspan class=\"\" data-state=\"delayed-open\" aria-describedby=\"radix-_r_t3_\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003ch5 data-end=\"736\" data-start=\"624\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eQ\u0026amp;A\u003c\/span\u003e\u003c\/h5\u003e\n\u003cp data-start=\"87\" data-end=\"271\"\u003e\u003cstrong data-start=\"87\" data-end=\"132\"\u003eQ: What type of HVAC indoor unit is this?\u003c\/strong\u003e\u003cbr data-start=\"132\" data-end=\"135\"\u003eA: This is a \u003cstrong data-start=\"148\" data-end=\"194\"\u003ewall‑mounted mini‑split indoor air handler\u003c\/strong\u003e designed for ductless heating and cooling systems using R454B refrigerant.\u003c\/p\u003e\n\u003cp data-start=\"273\" data-end=\"538\"\u003e\u003cstrong data-start=\"273\" data-end=\"310\"\u003eQ: What capacity does it support?\u003c\/strong\u003e\u003cbr data-start=\"310\" data-end=\"313\"\u003eA: It delivers \u003cstrong data-start=\"328\" data-end=\"367\"\u003e12,000 BTU nominal cooling capacity\u003c\/strong\u003e and around \u003cstrong data-start=\"379\" data-end=\"418\"\u003e13,200 BTU nominal heating capacity\u003c\/strong\u003e (system dependent), making it ideal for medium‑sized rooms up to about 500 sq ft. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"540\" data-end=\"764\"\u003e\u003cstrong data-start=\"540\" data-end=\"581\"\u003eQ: What are key performance features?\u003c\/strong\u003e\u003cbr data-start=\"581\" data-end=\"584\"\u003eA: Features include \u003cstrong data-start=\"604\" data-end=\"627\"\u003emultiple fan speeds\u003c\/strong\u003e, \u003cstrong data-start=\"629\" data-end=\"662\"\u003ePowerful and Smart Dry+ modes\u003c\/strong\u003e, and \u003cstrong data-start=\"668\" data-end=\"697\"\u003eDual Vane airflow control\u003c\/strong\u003e for flexible comfort tuning. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"766\" data-end=\"1033\"\u003e\u003cstrong data-start=\"766\" data-end=\"824\"\u003eQ: How does it improve indoor comfort and air quality?\u003c\/strong\u003e\u003cbr data-start=\"824\" data-end=\"827\"\u003eA: It includes \u003cstrong data-start=\"842\" data-end=\"871\"\u003eadvanced 3D i‑see Sensor®\u003c\/strong\u003e for energy‑efficient temperature adjustment and \u003cstrong data-start=\"920\" data-end=\"948\"\u003etriple‑action filtration\u003c\/strong\u003e to reduce dust, odors, and airborne particles. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1035\" data-end=\"1268\"\u003e\u003cstrong data-start=\"1035\" data-end=\"1072\"\u003eQ: Can it be controlled remotely?\u003c\/strong\u003e\u003cbr data-start=\"1072\" data-end=\"1075\"\u003eA: Yes — a \u003cstrong data-start=\"1086\" data-end=\"1128\"\u003ehandheld remote controller is included\u003c\/strong\u003e, and the unit can also connect via Wi‑Fi to the Mitsubishi Comfort app for convenient remote control. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1270\" data-end=\"1543\"\u003e\u003cstrong data-start=\"1270\" data-end=\"1329\"\u003eQ: What design and installation benefits does it offer?\u003c\/strong\u003e\u003cbr data-start=\"1329\" data-end=\"1332\"\u003eA: Its \u003cstrong data-start=\"1339\" data-end=\"1367\"\u003eslim wall‑mounted design\u003c\/strong\u003e fits easily into living rooms, bedrooms, or offices, and pairs with compatible outdoor mini‑split condensers (single‑zone or multi‑zone). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1545\" data-end=\"1742\"\u003e\u003cstrong data-start=\"1545\" data-end=\"1575\"\u003eQ: Is the operation quiet?\u003c\/strong\u003e\u003cbr data-start=\"1575\" data-end=\"1578\"\u003eA: Yes — the indoor unit operates \u003cstrong data-start=\"1612\" data-end=\"1643\"\u003equietly at low sound levels\u003c\/strong\u003e, making it suitable for spaces where low noise is important. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1744\" data-end=\"2000\"\u003e\u003cstrong data-start=\"1744\" data-end=\"1798\"\u003eQ: What refrigerant and compatibility does it use?\u003c\/strong\u003e\u003cbr data-start=\"1798\" data-end=\"1801\"\u003eA: Uses \u003cstrong data-start=\"1809\" data-end=\"1830\"\u003eR454B refrigerant\u003c\/strong\u003e, a lower global‑warming alternative to older refrigerants, and pairs with Mitsubishi R454B outdoor units for efficient performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5 data-end=\"736\" data-start=\"624\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cbr\u003eMaintenance Tips\u003c\/span\u003e\u003c\/h5\u003e\n\u003cul data-start=\"76\" data-end=\"1503\"\u003e\n\u003cli data-section-id=\"1uc4ze3\" data-start=\"76\" data-end=\"274\"\u003e\n\u003cp data-start=\"78\" data-end=\"274\"\u003e\u003cstrong data-start=\"78\" data-end=\"122\"\u003e12,000 BTU cooling \/ ~13,200 BTU heating\u003c\/strong\u003e (nominal), with modulation up to ~16,100 BTU cooling and ~23,500 BTU heating paired to a suitable outdoor unit. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1cc7nlt\" data-start=\"275\" data-end=\"445\"\u003e\n\u003cp data-start=\"277\" data-end=\"445\"\u003e\u003cstrong data-start=\"277\" data-end=\"297\"\u003eHigh efficiency:\u003c\/strong\u003e ~29.9 SEER2, ~15.4 EER2, ~12.4 HSPF2 (IV) with ENERGY STAR® efficiency when paired with compatible outdoor. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"85w7tg\" data-start=\"446\" data-end=\"599\"\u003e\n\u003cp data-start=\"448\" data-end=\"599\"\u003e\u003cstrong data-start=\"448\" data-end=\"471\"\u003eR‑454B refrigerant:\u003c\/strong\u003e Designed for modern low‑GWP refrigerant systems for improved environmental performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1j9t2pv\" data-start=\"600\" data-end=\"738\"\u003e\n\u003cp data-start=\"602\" data-end=\"738\"\u003e\u003cstrong data-start=\"602\" data-end=\"629\"\u003eSlim wall‑mount design:\u003c\/strong\u003e Compact and contemporary footprint ideal for rooms up to ~500 sq ft. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"xfln4j\" data-start=\"739\" data-end=\"931\"\u003e\n\u003cp data-start=\"741\" data-end=\"931\"\u003e\u003cstrong data-start=\"741\" data-end=\"772\"\u003eAdvanced airflow \u0026amp; comfort:\u003c\/strong\u003e Multiple fan speeds, Dual Vane airflow control, Smart Dry+ humidity control, and 3D i‑see Sensor for adaptive comfort. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1jqn02g\" data-start=\"932\" data-end=\"1102\"\u003e\n\u003cp data-start=\"934\" data-end=\"1102\"\u003e\u003cstrong data-start=\"934\" data-end=\"963\"\u003eTriple‑action filtration:\u003c\/strong\u003e Combines microparticle and electrostatic enzyme filters; carbon‑based deodorizing filter optional. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"11vuh5e\" data-start=\"1103\" data-end=\"1223\"\u003e\n\u003cp data-start=\"1105\" data-end=\"1223\"\u003e\u003cstrong data-start=\"1105\" data-end=\"1125\"\u003eQuiet operation:\u003c\/strong\u003e Low indoor sound levels with multiple fan speed settings. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1lfvmo3\" data-start=\"1224\" data-end=\"1374\"\u003e\n\u003cp data-start=\"1226\" data-end=\"1374\"\u003e\u003cstrong data-start=\"1226\" data-end=\"1249\"\u003eWi‑Fi connectivity:\u003c\/strong\u003e Optional Comfort app control plus remote controller included for flexible operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"4sngjb\" data-start=\"1375\" data-end=\"1503\"\u003e\n\u003cp data-start=\"1377\" data-end=\"1503\"\u003e\u003cstrong data-start=\"1377\" data-end=\"1411\"\u003eWall mounting \u0026amp; flared piping:\u003c\/strong\u003e Standard 1\/4″ liquid and 3\/8″ gas flared connections. \u003cspan class=\"\" data-state=\"delayed-open\" aria-describedby=\"radix-_r_hk_\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mitsubishi","offers":[{"title":"Default Title","offer_id":54214648922451,"sku":"MSZFX12NL","price":686.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/4179\/5667\/files\/3_1eb03271-6319-43b6-a534-cdf98a98073b.png?v=1783345424","url":"https:\/\/www.mybackyardzone.com\/products\/msz-fx12nl-mitsubishi-12-000-btu-wall-mounted-unit","provider":"SanaFlex","version":"1.0","type":"link"}