1 Ton DIY Mini Split: 12,000 BTU Systems You Install Yourself by Zone Air
A 1 ton DIY mini split is a 12,000 BTU ductless heat pump — the most-installed size, ideal for rooms up to about 550 sq ft like master bedrooms, living rooms, and finished basements. Zone Air’s 1-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 Ton (12,000 BTU) Mini Split Right for You?
One ton equals 12,000 BTU of heating and cooling. As a rule of thumb (about 20 BTU per sq ft), a 1-ton system comfortably handles a room of roughly 350–550 sq ft — the most common single-room size. Sun-facing walls, vaulted ceilings, and open kitchens reduce that coverage, so check your space with the calculator before you buy.
Need less? A 9,000 BTU (3/4 ton) system fits 200–350 sq ft. Need more? Step up to 1.5 ton (18,000 BTU) for spaces up to 800 sq ft.
Get Your 1 Ton System
Browse Zone Air’s 12,000 BTU systems, or size your room first with the free calculator.