Mini-Split BTU Sizing Calculator
Size your mini-split AC unit by US Climate Zone (IECC Zones 1-8), ceiling height, sun exposure, and room type.
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❄️ Room Size & US Climate Parameters
400 sq ft
100 sq ft
1,000 sq ft
2,000 sq ft
Recommended Mini-Split Capacity
18,000 BTU (1.5 Ton)
Raw Heating/Cooling Load
12,800 BTU
Zone 4 sizing
Target Room: 400 sq ft
Electrical: 20A @ 208/230V
SEER2 Target: 18–22+ SEER2
Ductless Mini-Split Installation Layout
18,000 BTU · Zone 4🛒 Mini-Split HVAC Equipment Checklist
18,000 BTU Ductless Mini-Split Kit
Inverter heat pump with remote & line set
1 System
Check Amazon ›
Decorative Line Set Slim Duct Cover
Weatherproof PVC channel for exterior wall
1 Kit (14')
Check Amazon ›
Electrical Disconnect Box & Whip
20A @ 208/230V rated
1 Disconnect
Check Home Depot ›
⚡
Need EPA-Certified Mini-Split Installation?
Vacuum micron evacuation and 230V electrical disconnect wiring require licensed HVAC & electrical permits.
✓ Matching licensed HVAC mini-split installers in ZIP !
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📐 Engineering Principles & Formulas
All calculations adhere strictly to US Imperial standards and standard retail SKU yields (Quikrete, Home Depot, Lowe's, ASTM standards):
Formulas verified against US contractor standards and material packaging specifications.
Pre-Solved Dimension Calculators
19 Pre-Calculated SizesJump directly to your exact dimensions with pre-solved material quantities and instant answers:
What Size Mini-Split for a 200 sq ft bedroom in Climate Zone 2? (9000 BTU)
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What Size Mini-Split for a 250 sq ft bedroom in Climate Zone 4? (9000 BTU)
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What Size Mini-Split for a 300 sq ft living in Climate Zone 3? (12000 BTU)
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What Size Mini-Split for a 350 sq ft bedroom in Climate Zone 4? (12000 BTU)
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What Size Mini-Split for a 400 sq ft bedroom in Climate Zone 5? (18000 BTU)
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What Size Mini-Split for a 450 sq ft living in Climate Zone 3? (18000 BTU)
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What Size Mini-Split for a 500 sq ft living in Climate Zone 4? (18000 BTU)
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What Size Mini-Split for a 500 sq ft garage in Climate Zone 4? (24000 BTU)
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What Size Mini-Split for a 600 sq ft sunroom in Climate Zone 2? (24000 BTU)
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What Size Mini-Split for a 600 sq ft living in Climate Zone 5? (24000 BTU)
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What Size Mini-Split for a 750 sq ft living in Climate Zone 4? (24000 BTU)
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What Size Mini-Split for a 800 sq ft living in Climate Zone 3? (30000 BTU)
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What Size Mini-Split for a 1000 sq ft living in Climate Zone 4? (36000 BTU)
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What Size Mini-Split for a 1200 sq ft living in Climate Zone 3? (36000 BTU)
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What Size Mini-Split for a 1500 sq ft living in Climate Zone 4? (48000 BTU)
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What Size Mini-Split for a 400 sq ft bedroom in Climate Zone 6? (18000 BTU)
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What Size Mini-Split for a 600 sq ft living in Climate Zone 6? (30000 BTU)
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What Size Mini-Split for a 800 sq ft sunroom in Climate Zone 1? (36000 BTU)
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What Size Mini-Split for a 400 Sq Ft Garage in Texas? (12,000 BTU)
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🔗 Free Contractor Website Embed Widget
Contractors, builders, and suppliers can embed this interactive Mini-Split BTU Sizing Calculator on their website for free.
<iframe src="https://www.yardandslab.com/embed/mini-split-btu-calculator" width="100%" height="650" frameborder="0" style="border:1px solid #e2e8f0;border-radius:12px;"></iframe>
❓ Frequently Asked Questions: Mini-Split BTU Sizing Calculator
Yes. Every calculation outputs standard US construction packaging and measurements: cubic yards, 40lb/60lb/80lb Quikrete bags, US short tons (2,000 lbs), fluid ounces, gallons, and linear feet matching Home Depot and Lowe's retail inventory.
Yes. Calculators default to a contractor-standard 10% waste factor to accommodate form flex, uneven subgrades, and spillage. You can adjust this to 5% or 15% using the interactive input controls.
Generic calculators rely on basic geometric boxes without considering physical building realities: corrugated pipe displacement in French drains, actual nominal post sizes (3.5" for 4x4, not 4.0"), 15% compaction factors for crushed aggregate, and IECC US Climate Zones.
Yes! Click the "Print / PDF" button on any calculator to generate a clean, branded one-page materials shopping list formatted for mobile or paper printout at the lumberyard.