Single-Zone Mini Splits
One indoor unit for one conditioned zone.
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Ductless Mini Split Systems
Comfort, room
by room.
Find single-zone, multi-zone, and DIY mini-split systems, plus the equipment and installation supplies for your project.
A good place to start.
Conditioning one space? Explore single-zone systems and indoor-unit styles.
Shop single-zone mini splitsFind your system
Shop mini splits by zone & installation
Choose the number of zones you need, explore single-zone indoor styles, or start with DIY-designated equipment.
Multi-Zone Mini Splits
Explore systems for two through nine zones.
DIY Mini-Split Systems
Explore DIY-designated systems and bundles.
Mini-split equipment & installation supplies
Find line sets, mounting hardware, drainage, electrical supplies, and tools. Check each item's compatibility with your selected system.
Plan your next project
Choosing a ductless mini-split system
Ductless mini splits connect an outdoor unit with compatible indoor equipment to heat and cool individual spaces. Shop single-zone systems, multi-zone combinations, and DIY-designated systems at OnlineSupply.com. Start with the spaces you want to condition, then compare the equipment layout, capacity, and installation requirements.
Single-zone or multi-zone?
A single-zone mini split pairs an outdoor unit with one indoor unit. Multi-zone systems connect multiple compatible indoor units to a shared outdoor unit. Explore two through nine zones above, and confirm the manufacturer's approved combinations and capacity limits before choosing a system.
Find an indoor style that fits
Single-zone options include wall-mounted units, ceiling cassettes, slim ceiling cassettes, floor-mounted units, and concealed-duct equipment. Available styles vary by system. Consider mounting space, service access, condensate drainage, and refrigerant line routing. Concealed-duct equipment also requires a suitable duct layout.
Compare DIY-designated systems
DIY mini-split systems may use precharged quick-connect line sets, depending on the model and bundle. Review the installation manual and included components carefully. Electrical work, permits, and other installation steps may still require a qualified professional; the DIY designation does not make every part of the project suitable for self-installation.
Plan for equipment and accessories
Browse mini-split equipment and accessories alongside line sets, mounting hardware, drainage components, and electrical supplies. Confirm refrigerant type, connection sizes, line lengths, voltage, and control compatibility. Included accessories differ by listing, so review the selected bundle before adding separate parts.
Common mini-split questions
What size mini split do I need?
The required capacity depends on insulation, climate, windows, ceiling height, occupancy, and other load factors. Have an HVAC professional calculate the heating and cooling load for each zone. Square footage alone is not enough to confirm the right system size.
Can I add more indoor units later?
Only if the outdoor unit supports the additional indoor units and the manufacturer's combination and capacity requirements are met. Check available connections, model compatibility, and the planned total load before buying a system with future expansion in mind.
Does every mini split provide heating and cooling?
Check the selected model. Heat-pump mini splits provide heating and cooling, while cooling-only equipment does not provide heat-pump heating. Review the model's operating-temperature range and rated performance for your climate.
Are line sets and installation parts included?
Contents vary by system and bundle. Check the product listing for indoor and outdoor units, line sets, controls, and other components. Match any additional accessories to the exact equipment models and manufacturer requirements.
