1.5 Ton DIY Mini Split: 18,000 BTU Systems You Install Yourself by Zone Air
A 1.5 ton DIY mini split is an 18,000 BTU ductless heat pump — sized for larger spaces up to about 800 sq ft like great rooms, open-plan main floors, basements, and ADUs. Zone Air’s 1.5-ton systems are pre-charged and quick-connect, so you install it yourself with no vacuum pump and no HVAC contractor.
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Is a 1.5 Ton (18,000 BTU) Mini Split Right for You?
One and a half tons equals 18,000 BTU of heating and cooling. At roughly 20 BTU per sq ft, a 1.5-ton system covers a space of about 600–800 sq ft — great rooms, large open floors, and finished basements. For a single open volume this is often the largest single-head size you’ll need.
Conditioning more than one room? Instead of one oversized head, a dual-zone or multi-zone system gives each room its own thermostat. Need less? See 1 ton (12,000 BTU).
Get Your 1.5 Ton System
Browse Zone Air’s 18,000 BTU systems, or size your space first with the free calculator.