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Understanding 18,000 BTU Mini Split Systems
Not all systems in this collection will show 18k on the indoor units—and that’s intentional. An 18,000 BTU mini split system refers to the capacity of the outdoor condenser, which powers the entire system. In multi-zone setups, that capacity is distributed across multiple indoor air handlers.
For example:
- A system may include (1) 12,000 BTU air handler + (1) 6,000 BTU air handler
- Or 9k air handler + 9k air handler combinations
Together, they are powered by an 18k BTU condenser, delivering balanced heating and cooling across multiple rooms.
This allows you to:
- Customize comfort by room
- Improve energy efficiency
- Avoid over-conditioning unused spaces
Planning installation? See our Mini Split Installation Guide for a step-by-step overview.
MRCOOL DIY 18,000 BTU Mini Split 1 Zone Ductless Air Conditioner & Heat Pump - 1 Room 750 SQ. FT - 5th Gen - WALL MOUNTED - DIY-18-HP-WM-230D25-O
$2,909.00MRCOOL DIY 18K BTU Complete System Bundle | 1.5-Ton Mini-Split for 500–750 Sq. Ft. Professional heating and cooling in one box — includes 18K BTU indoor air handler, outdoor condenser,...
MRCOOL DIY 5th Gen 12,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 6k+6k Wall Mounted | Covers 2 Rooms, 400 Sq Ft
$2,923.00 – $3,643.00Custom Comfort for Two Zones — MRCOOL DIY 5th Gen 12,000 BTU Multi-Zone System Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen 12k BTU 2-Zone...
MRCOOL DIY 5th Gen 15,000 BTU 2-Zone Ductless Mini Split Air Conditioner & Heat Pump | 6k+9k Wall Mounted | Covers 2 Rooms, 575 Sq Ft
$2,998.00 – $3,718.00MRCOOL DIY 15,000 BTU 2-Zone Ductless Mini Split Air Conditioner & Heat Pump Heat and cool two rooms independently with this complete DIY system. Includes two air handlers, one condenser,...
MRCOOL DIY 5th Gen 18,000 BTU 2-Zone Ductless Mini Split Air Conditioner & Heat Pump | 6k+12k Wall Mounted | Covers 2 Rooms, 700 Sq Ft
$3,155.00 – $3,875.00MRCOOL DIY 18K BTU 2 Zone Mini Split System | Heat & Cool Two Rooms 700 Sq. Ft. Take control of your home’s comfort with the MRCOOL DIY 5th Gen...
MRCOOL DIY 5th Gen 18,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 9k+9k Wall Mounted | Covers 2 Rooms, 750 Sq Ft
$3,073.00 – $3,793.00Custom Comfort for Two Zones — MRCOOL DIY 5th Gen 18,000 BTU Multi-Zone System Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen 18k BTU 2-Zone...
MRCOOL DIY 5th Gen 18,000 BTU 2-Zone Ductless Mini Split Air Conditioner & Heat Pump | 9k+12k Wall Mounted | Covers 2 Rooms, 875 Sq Ft
$3,239.00 – $3,959.00MRCOOL DIY 18K BTU 2-Zone Mini Split System | Heat & Cool Two Rooms (875 Sq. Ft.) Take control of your home’s comfort with the MRCOOL DIY 5th Gen 2-Zone...
MRCOOL DIY 5th Gen 18,000 BTU 3-Zone Ductless Mini Split with Heat Pump | 6k+6k+6k Wall Mounted | Covers 3 Rooms, Up to 600Sq Ft
$3,607.00 – $4,517.00Custom Comfort for Three Zones — MRCOOL DIY 5th Gen 18,000 BTU 3-Zone System Achieve perfect temperatures in three separate areas with the MRCOOL DIY 5th Gen 18k BTU 3-Zone...
MRCOOL DIY 5th Gen 18,000 BTU Ductless Mini Split with Heat Pump | Ceiling Cassette | Covers 1 Room, 750 Sq Ft | Model DIY-18-HP-CM-230D25-O
$3,418.00MRCOOL DIY 18K BTU Single Zone Complete Ceiling System | For Rooms up to 750 Sq. Ft. Upgrade your space with the MRCOOL DIY 18K BTU Complete Single Zone System...
MRCOOL DIY 5th Gen 12,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 6k+6k Ceiling Cassette | Covers 2 Rooms, 400 Sq Ft
$4,633.00 – $5,353.00Discreet Comfort for Two Zones — MRCOOL DIY 5th Gen 12,000 BTU 2-Zone System with OuttaSight® Cassettes Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen...
MRCOOL DIY 5th Gen 15,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 6k+9k Ceiling Cassette | Covers 2 Rooms, 575 Sq Ft
$4,731.00 – $5,451.00Discreet Comfort for Two Zones — MRCOOL DIY 5th Gen 15,000 BTU 2-Zone System with OuttaSight® Cassettes Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen...
MRCOOL DIY 5th Gen 18,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 9k+9k Ceiling Cassette | Covers 2 Rooms, 750 Sq Ft
$4,829.00 – $5,549.00Discreet Comfort for Two Zones — MRCOOL DIY 5th Gen 18,000 BTU 2-Zone System with OuttaSight® Cassettes Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen...
MRCOOL DIY 5th Gen 18,000 BTU 2-Zone Ductless Mini Split with Heat Pump | 6k+12k Ceiling Cassette | Covers 2 Rooms, 700 Sq Ft
$4,742.00 – $5,462.00Discreet Comfort for Two Zones — MRCOOL DIY 5th Gen 18,000 BTU 2-Zone System with OuttaSight® Cassettes Achieve perfect temperatures in two separate areas with the MRCOOL DIY 5th Gen...
MRCOOL DIY 5th Gen 18,000 BTU 3-Zone Ductless Mini Split with Heat Pump | 6k+6k+6k Ceiling Cassette | Covers 3 Rooms, Up to 600 Sq Ft
$6,172.00 – $7,082.00Discreet Comfort for Three Zones — MRCOOL DIY 5th Gen 18,000 BTU Multi-Zone System with OuttaSight® Cassettes Achieve perfect temperatures in three separate areas with the MRCOOL DIY 5th Gen...