The Catalog · 18,000 BTU Mini Splits
18,000 BTU Mini Splits.
Right-Sized for 600-900 sq ft.
A 18,000 BTU mini split (1.5 ton) is sized to cool and heat a large living room, open kitchen, finished basement, or 2-car garage — roughly 600-900 sq ft. At this size, you get whisper-quiet operation, modern inverter efficiency (up to 22.5 SEER2 in 5th Generation models), and per-room temperature control. Available as DIY pre-charged systems or pro-install Advantage and Universal series. Below are our in-stock 18,000 BTU systems, shipped to all 50 states.
In Stock · Ships to All 50 States
In-Stock 18,000 BTU Mini Splits
MRCOOL® 18k DIY 5th Generation Bundle - includes Condenser, Air Handler, DIY® Quick Connect® Line Set, DIYPRO® Cable, and Remote - 230v
Ships nationwide·In stock
MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette
Ships nationwide·In stock
Advantage 5th Gen 18k BTU 230V System
Ships nationwide·In stock
EasyPro 5th Generation 18k BTU 230V System
Ships nationwide·In stock
Central Ducted 18k Complete Unitary System
Ships nationwide·In stock
1.5 Ton BTU R-410A Downflow Cased Evaporator Coil
Ships nationwide·In stock
Buying Guide
How to choose the right 18,000 BTU mini split
Not every 18,000 BTU mini split is the same. Series, voltage, install type, and cold-climate capability all change the buying decision. Here's how to pick correctly.
Is 18,000 BTU the right size for my space?
A 18,000 BTU unit covers approximately 600-900 sq ft in a moderately insulated home with 8-foot ceilings. If your room has high ceilings, lots of west-facing windows, or runs hotter than the rest of the house (kitchen, sunroom), size up. If the room is well-insulated and shaded, 18,000 BTU can stretch to the high end of the range. Best practice: use a Manual J load calculation or our system finder for an exact size.
DIY install vs pro install
MrCool DIY and EasyPro 18,000 BTU systems ship with pre-charged Quick Connect line sets — no vacuum pump, no refrigerant handling, no HVAC license. Most homeowners install in 4-8 hours. Advantage, Universal, and Olympus 18,000 BTU systems require a licensed HVAC technician (lower equipment cost, but $1,500-$3,000 in labor).
Voltage requirements
18,000 BTU mini splits run on 230V (same circuit type as a clothes dryer or electric range). Verify your electrical panel has space for a dedicated breaker before buying. An electrician typically charges $200-$500 to add a dedicated circuit and disconnect box near the outdoor unit.
Cold climate? Get Hyper Heat
Standard 18,000 BTU heat pumps work down to ~5°F. Hyper Heat (cold climate) models work down to -22°F at full rated capacity. If your winter design temp is below 20°F, the Hyper Heat upgrade pays for itself in heating performance and qualifies for stronger federal/state rebates.
Federal tax credit and state rebates
18,000 BTU mini splits with SEER2 ≥ 16 and HSPF2 ≥ 8.1 qualify for the federal 25C tax credit (up to $2,000). Many states stack additional rebates of $500-$5,000 — Massachusetts (Mass Save), New York (NYSERDA), Maine, Vermont, and the Pacific Northwest are especially generous. Save your invoice and AHRI certificate for tax filing.
Frequently Asked
Common questions
What size room does a 18,000 BTU mini split cool?+
A 18,000 BTU mini split (1.5 ton) cools and heats approximately 600-900 sq ft in a typical home with 8-foot ceilings and standard insulation. That's enough for a large living room, open kitchen, finished basement, or 2-car garage. Adjust up or down based on ceiling height, window exposure, and insulation quality.
How much does a 18,000 BTU mini split cost?+
MrCool DIY and EasyPro 18,000 BTU systems range from approximately $700-$1,800 depending on series and features (WiFi, Hyper Heat). Advantage and Universal pro-install 18,000 BTU systems are $900-$2,500. Add $0 for DIY install or $1,500-$3,000 for professional installation.
What voltage does a 18,000 BTU mini split need?+
18,000 BTU mini splits run on 230V (same circuit type as a clothes dryer or electric range). Confirm your electrical panel has open breaker space and your home wiring supports the required amperage before buying. An electrician can add a dedicated circuit for $200-$500.
Can I install a 18,000 BTU mini split myself?+
Yes — MrCool DIY and EasyPro 18,000 BTU systems are designed for homeowner installation. They ship with pre-charged Quick Connect line sets, so no vacuum pump, no refrigerant handling, no HVAC license. You'll need to add a dedicated electrical circuit, which most homeowners hire an electrician for.
Does a 18,000 BTU mini split heat as well as cool?+
Yes — modern 18,000 BTU mini splits are heat pumps that both cool and heat. Standard models work down to ~5°F. Hyper Heat models work down to -22°F at full rated capacity. Both cool the same square footage range (600-900 sq ft).
Does a 18,000 BTU mini split qualify for the heat pump tax credit?+
Most 18,000 BTU MrCool systems qualify for the federal 25C Energy Efficient Home Improvement Credit (up to $2,000 back) provided they meet CEE Tier minimums (SEER2 ≥ 16, HSPF2 ≥ 8.1). The MrCool DIY 5th Generation hits 22.5 SEER2 and qualifies. Save your AHRI certificate for tax filing.