Calculator › Sizing › 1500 sq ft

What Size Mini Split for 1,500 Sq Ft?

Short answer: ≈30,000 BTU/h → buy the 36,000 BTU class at standard conditions (8 ft ceilings, average sun and insulation, DOE zone 4, two occupants), read straight off the ENERGY STAR chart. verified 2026-06-10 Adjust below for your real room.

Your room

Pre-set to 1500 sq ft — change anything and the answer updates instantly.

Which zone am I in?
  • Zone 1: South Florida, Hawaii, Puerto Rico
  • Zone 2: Most of Florida, south Texas, southern Louisiana, Phoenix area
  • Zone 3: Most of the Southeast, central Texas, southern California
  • Zone 4: Virginia, Kentucky, Missouri, Kansas, coastal Oregon/Washington
  • Zone 5: Pennsylvania, Ohio, Illinois, Iowa, Colorado, southern New England
  • Zone 6: Minnesota, Wisconsin, Montana, Vermont, New Hampshire, most of Maine
  • Zone 7: North Dakota, northern Minnesota, high Rockies
  • Zone 8: Interior and northern Alaska

State examples are approximate — zones are assigned by county. Use the DOE lookup for your county. DOE county lookup ↗

1,500 sq ft by climate zone

DOE / IECC zoneAdjusted estimateBuy class
Zone 1 South Florida, Hawaii, Puerto Rico34,500 BTU36,000 BTU class
Zone 2 Most of Florida, south Texas, southern Louisiana, Phoenix area33,000 BTU36,000 BTU class
Zone 3 Most of the Southeast, central Texas, southern California31,500 BTU36,000 BTU class
Zone 4 Virginia, Kentucky, Missouri, Kansas, coastal Oregon/Washington30,000 BTU36,000 BTU class
Zone 5 Pennsylvania, Ohio, Illinois, Iowa, Colorado, southern New England30,000 BTU36,000 BTU class
Zone 6 Minnesota, Wisconsin, Montana, Vermont, New Hampshire, most of Maine30,000 BTU36,000 BTU class
Zone 7 North Dakota, northern Minnesota, high Rockies30,000 BTU36,000 BTU class
Zone 8 Interior and northern Alaska30,000 BTU36,000 BTU class

Zone multipliers are editorial rules of thumb (cooling-season length/intensity); zone definitions per the DOE IECC climate-zone map. In zones 5+ heating, not cooling, usually decides the size — see methodology.

What moves the number

  • Very sunny room: +10% (ENERGY STAR) → 33,000 BTU → 36,000 class
  • 10 ft ceilings: +25% air volume (rule of thumb) → 37,500 BTU → 36,000 class
  • Kitchen: +4,000 BTU (ENERGY STAR) → 34,000 BTU → 36,000 class

Verified 36,000 BTU models for 1,500 sq ft

Single-zone mini-split models in the 36,000 BTU class — every spec sourced and dated.
ModelBTUSEER2HSPF2VoltMin tempInstallVerified priceSource
GREE Livo Gen4 (R32)
LIV36HP230V1R32AO / LIV36HP230V1R32AH		 36,000 21 8.5 208/230V -13°F Pro $4,059 (hvacdirect.com, Jun 2026) spec ↗
MRCOOL DIY 4th Gen
DIY-36-HP-C-230C25		 36,000 18 — 208/230V — DIY — spec ↗

— = not published by the manufacturer (we never guess)Specs verified against each linked source on 2026-06-10Prices move — treat as bands, not quotes

More on what a 36,000 BTU unit covers →

FAQ

What size mini split do I need for 1500 sq ft?

Baseline answer: about 30,000 BTU/h of cooling per the ENERGY STAR chart, which means buying a 36,000 BTU class unit. Sun, ceiling height, insulation and climate zone move the number — use the calculator above with your real inputs.

Will a smaller unit work in 1500 sq ft?

If the room is heavily shaded, ENERGY STAR says reduce capacity ~10% (≈27,000 BTU here), which usually keeps you in the same size class. Undersizing beyond that means the unit runs flat-out and may not hold temperature on peak days.

What about heating 1500 sq ft in a cold climate?

Heat pump output falls as outdoor temperature drops. If this unit is your primary winter heat in DOE zones 5+, size up one class and pick a model rated for low ambients (−13°F or below; the Senville AURA in this dataset is rated to −22°F). Confirm with a Manual J calculation.

Estimate only — not a Manual J load calculation and not professional advice. Confirm with a licensed installer. Methodology & sources.