Shop by
1.5-ton cooling for rooms up to 400 sq ft, powered by the standard outlet already on your wall. No 230V circuit required.
BTU Capacity: 18,000 BTU (1.5 Ton)
SEER Rating: 17 SEER
Voltage: 115V (compatible with standard 110/120V household outlets)
Circuit Breaker: dedicated 115V circuit
Compressor Type: Variable Speed DC Inverter
Room Coverage: 350–400 sq ft
Zones: Single Zone
Refrigerant: R-410A
Indoor Unit Type: Wall Mounted
Smart Features: Mobile App Control, WiFi Enabled, Self-Cleaning Mode, Sleep Mode
Warranty: 1-Year Parts / 5-Year Compressor (professional installation required)
Installation: Licensed HVAC Contractor Required
Shipping: Free 2-Day Shipping Anywhere in the US
This unit needs its own dedicated 115V circuit. It cannot share a circuit with other appliances. A dedicated 115V outlet uses standard household wiring, and your HVAC contractor or electrician can set one up quickly and affordably. Far simpler than pulling a new 230V line.
We built the Filterbuy 18,000 BTU mini split because homeowners kept running into the same wall: the unit they needed required a 230V dedicated circuit, which they didn't have. Before installation could start, they were looking at $500–$1,500 in electrician fees, permits, and panel work. This unit runs on standard 115V household power — the same circuits already in your walls — and skips that cost entirely.
At 1.5 tons of cooling and heating capacity, this unit handles the rooms a 12,000 BTU model can't. Large living rooms, open studios, master suites, and oversized garages up to 400 square feet. The DC inverter compressor adjusts its speed to match what your room actually needs: full power when it's hot, a quiet hum when it's maintaining temperature. That variable speed operation keeps electricity bills lower, and compressor wear down compared to fixed-speed systems. Built-in app control puts temperature, schedules, and heating or cooling mode selection in your pocket.
This is the right unit for older homes without 230V wiring in living spaces, rental properties where major electrical modifications aren't practical, and additions where only standard outlets were roughed in. It's also the right call for any homeowner who wants to keep the total project cost honest — because on most jobs, the 230V electrical work alone costs more than the mini split itself.
Every unit ships free in 2 days with everything your contractor needs already in the box. Professional-grade quality, backed by the air quality experts at Filterbuy.
Most 18,000 BTU mini split projects don't die from product problems. They die from electrical shocks.
Nearly every 18K BTU mini split on the market requires a 230V dedicated circuit — and most homes don't have one where they need it, especially in bedrooms, living rooms, and properties built before the 1970s. Installing one means hiring a licensed electrician, pulling permits, running new wiring through finished walls, and potentially upgrading the breaker panel. That adds $500–$1,500 to the project before the mini split installation even starts. For many homeowners, that cost is what ends the project.
This unit runs on the same 115V power as the rest of your home. Your HVAC contractor installs the mini split. The expensive high-voltage electrician work doesn't enter the picture. At a minimum, your electrician runs a dedicated 115V outlet. Standard household wiring. A straightforward job that costs dramatically less than adding a new 230V circuit.
The biggest beneficiaries are homeowners in older homes where 230V circuits don't exist in living spaces. Landlords who need to add climate control to rental units without major electrical changes. Owners of room additions and ADUs where only 115V was roughed in during construction. And buyers who've done the math — because on many jobs, the electrical upgrade alone costs more than the mini split itself.
A 115V unit at 18,000 BTU draws more amperage than a 230V unit delivering the same power. Same watts, lower voltage means higher current. That's why it needs a dedicated 115V circuit — it can't run off a shared outlet. But a dedicated 115V circuit is still significantly simpler and cheaper to set up than a new 230V line. Your contractor can confirm the right setup for your space.
At 18,000 BTU, this unit covers rooms that 12,000 BTU models simply can't reach: open-plan living rooms, large master bedrooms, studio apartments, and oversized garages up to 400 square feet. One wall-mounted unit handles it all.
Every other 18K BTU mini split on the market requires a 230V dedicated circuit. This one runs on standard 115V household power, which means no high-voltage electrician, no panel upgrades, and no 230V line. The savings on electrical work alone can exceed $1,000 — money that stays in your project budget.
The DC inverter compressor adjusts its speed continuously to match your room's demand. It ramps up for rapid cooling and dials back to a whisper when maintaining temperature. This is especially important at 115V, where efficient power management keeps your electricity bill in check. Lower energy use, more consistent comfort, and less compressor wear than fixed-speed alternatives.
Control your comfort from anywhere. Adjust temperature, set schedules, switch between heating and cooling modes, and monitor your system from the dedicated mobile app. Especially useful for spaces you don't use every day — garages, guest rooms — so they're comfortable the moment you walk in.
This isn't just an air conditioner. The built-in heat pump reverses the refrigerant cycle to provide heating in winter and cooling in summer from a single system. No separate space heaters, no supplemental equipment, no seasonal swaps. One unit, every month of the year.
An automated cleaning cycle dries the evaporator coil after each use, preventing mold and bacteria buildup. At 18,000 BTU, this system moves more air than smaller models, which means the coil and filter collect dust and allergens faster. The self-cleaning function protects air quality and extends the system's life. It's a premium maintenance feature at a mid-market price point.
Large living spaces that need more than 12,000 BTU but don't have 230V access have had no good mini split option — until now. This unit delivers 1.5-ton capacity on the outlet you already have, without the electrical work other units require.
Oversized master bedrooms, rooms with high ceilings, and suites with attached sitting areas need more cooling capacity than a standard 12K unit. Sleep mode and quiet operation keep things comfortable through the night. The 115V connection means no rewiring of your bedroom wall for a 230V outlet.
Homes built before the 1970s rarely have 230V circuits in bedrooms, living rooms, or common areas. Running new 230V wiring through finished walls is invasive, expensive, and sometimes requires a full panel upgrade. This mini split delivers modern, high-capacity climate control on your home's existing 115V infrastructure, without touching a wall.
Landlords who need to add climate control to rental units often can't justify the $500–$1,500 cost of 230V electrical work per unit. A 115V mini split at 18,000 BTU provides professional-grade heating and cooling without major infrastructure changes — a practical investment your tenants will appreciate.
Not every garage has a 230V outlet. If yours runs on standard 115V power and you need serious cooling and heating capacity, this is the highest-BTU option available on the market. No rewiring, no new high-voltage circuit — just 18,000 BTU from a standard outlet.
New construction additions and ADUs where only 115V was roughed in during the build. If the electrician didn't pull 230V wire to the addition, this mini split means you don't have to go back and open walls. Pair it with professional installation, and your space is climate-ready.
Everything your HVAC contractor needs for a complete professional installation:
Indoor Wall-Mount Air Handler Unit
Outdoor Condenser/Compressor Unit
Pre-Flared Copper Line Set
115V Power Supply Cable
Wireless Remote Control
Mounting Bracket and Hardware
Professional HVAC installation required. Self-installation voids the manufacturer's warranty. With free 2-day shipping, your contractor won't wait for parts.
This unit needs a dedicated 115V circuit. While no 230V line is required, the unit cannot share a circuit with other appliances. Your HVAC contractor or electrician can set up a dedicated 115V outlet using standard household wiring — a significantly simpler and more affordable job than installing a new 230V circuit.
You won't find another 18,000 BTU mini split at 115V anywhere. We know that because we looked across 15+ major retailers. We built this product because we know not every home has a 230V circuit, and nobody should have to spend $1,000+ on electrical work just to cool their living room.
As the nation's leading air filter provider, we also know that bigger systems need more attention. An 18,000 BTU unit moves significantly more air than a 12K model, which means the filter collects dust, dander, and allergens faster. Regular filter cleaning isn't optional — it's what keeps your system efficient, your air clean, and your energy bills where they should be.
Expert Maintenance Guidance tailored to higher-capacity systems that work harder and need more attention
Filter Cleaning Reminders so the maintenance that protects your investment doesn't slip through the cracks
Access to our IAQ Resource Library with guides on air quality, allergens, and system care
Free 2-Day Shipping on every order, anywhere in the US
Real Customer Support from people who understand air quality and HVAC
Other retailers ship you a box. We built a product no one else offers, and we back it with a decade of air quality expertise that no one else has either.
Yes. Most manufacturers have historically set 12,000 BTU as the upper limit for 115V operation, but advances in variable speed inverter compressor technology changed that. This unit delivers full 18,000 BTU cooling and heating on standard 110/120V household power. It does need a dedicated 115V circuit — not a shared outlet —, but that's a far simpler and more affordable setup than the 230V dedicated circuit every other 18K BTU mini split requires. Filterbuy is among the first to bring this capability to the residential market.
The Filterbuy 18,000 BTU mini split effectively cools and heats rooms up to 350–400 square feet. That covers large living rooms, open studios, master bedrooms with high ceilings, single-car garages, and home additions. Some competitors claim coverage up to 1,000 sq ft for 18K BTU units. Our conservative rating is based on real-world performance for genuine comfort, not marketing math.
Yes — a dedicated 115V circuit with a [XX]-amp breaker. The unit runs on standard 115V power (no 230V needed), but it draws enough current that it needs its own circuit and can't share with other appliances. A licensed electrician can set up a dedicated 115V outlet quickly and affordably. Standard household wiring, not the high-voltage work that a 230V installation requires.
Installing a new 230V dedicated circuit typically costs $500–$1,500, depending on your home's electrical panel capacity, the distance from the panel to the installation location, local permit requirements, and labor rates. In older homes that need a panel upgrade, the cost can exceed $2,000. By choosing the 115V model, you avoid that cost entirely. Even with the dedicated 115V circuit this unit does require, your electrical preparation costs are dramatically lower.
Not in any way that affects a residential installation. Both 115V and 230V versions consume the same wattage to deliver the same 18,000 BTU of cooling and heating. The 115V unit draws more amperage (same watts, lower voltage means higher current), but energy consumption — and your electricity bill — is measured in watts, not amps. There are marginally lower line losses at 230V over very long wire runs, but for typical residential distances under 50 feet, the efficiency difference is negligible. The variable speed inverter compressor maintains efficiency regardless of voltage input.
Yes. This system is a heat pump, providing cooling in summer and heating in winter from a single unit. The compressor reverses the refrigerant cycle to extract heat from outdoor air and bring it inside. One system, every season — which eliminates the need for separate heating equipment, especially useful in spaces like garages and additions where running supplemental heat would add even more cost and complexity.
No. Professional installation by a licensed HVAC contractor is required, and self-installation voids the manufacturer's warranty. Mini split installation involves handling refrigerant, making electrical connections, and properly mounting both the indoor and outdoor units. Everything your contractor needs is included in the box, and with Filterbuy's free 2-day shipping, there's no waiting on parts.
The indoor unit operates at low speed. Larger-capacity mini splits run slightly louder than 12K models at full output, but the variable speed inverter compressor spends most of its time at partial load, where noise levels drop significantly. For context, a whisper measures about 30 dBA, and a window air conditioner runs at 50–70 dBA. Even at 18,000 BTU, this unit is dramatically quieter than window alternatives.
Most mini split manufacturers have historically treated 12,000 BTU as the practical upper limit for 115V operation. At 18,000 BTU, a 115V unit draws roughly 50% more current than a 12K model, which requires more robust wiring and a dedicated circuit. Recent advances in variable speed inverter compressor technology made it possible to manage these higher current demands efficiently and safely. Filterbuy is among the first retailers to bring an 18,000 BTU 115V model to market — because homeowners in homes without 230V circuits deserve access to high-capacity cooling just as much as anyone else.
Yes. Like all mini splits, this unit has a built-in washable mesh filter that captures dust, pet dander, and airborne particles. At 18,000 BTU, the system moves more air than smaller models, which means the filter collects contaminants faster. Clean it every 2–4 weeks for best performance. Regular maintenance keeps airflow strong, energy efficiency high, and your indoor air quality at its best.
This is where Filterbuy's expertise matters most. We've spent over a decade helping millions of homeowners maintain cleaner air. When you buy a mini split from us, you get access to maintenance guides, filter care reminders, and the knowledge to keep your system running efficiently for years.
The only 18,000 BTU mini split that runs on standard 115V power. Cool and heat rooms up to 400 sq ft without the cost of 230V electrical work. Variable speed efficiency, app control, and free 2-day shipping — backed by the air quality experts at Filterbuy.
Also Available:
18,000 BTU Mini Split — 230V for spaces with existing 230V circuits
12,000 BTU Mini Split for rooms up to 300 sq ft
9,000 BTU Mini Split for rooms up to 200 sq ft
Shop All Mini Split Systems
