1. What is Mini Split Sizing?

Mini split sizing determines the appropriate cooling capacity (in BTU/h) needed for a space based on its square footage. Proper sizing ensures efficient operation and optimal comfort.

2. How Does the Calculator Work?

The calculator uses the rule-of-thumb formula:

Where:

• \( BTU/h \) — British Thermal Units per hour (cooling capacity)
• \( Area \) — Area of the space in square feet

Explanation: This basic calculation assumes standard ceiling heights and typical insulation. The multiplier of 20 BTU per square foot is a general guideline for moderate climates.

3. Importance of Proper Sizing

Details: Correct mini split sizing is crucial for energy efficiency, proper dehumidification, and system longevity. Oversized units short-cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Measure your space accurately in square feet. For irregularly shaped rooms, calculate as separate rectangles and add the areas together.

5. Frequently Asked Questions (FAQ)

Q1: What if my room has high ceilings?
A: For ceilings over 8 feet, add 10% to the calculated BTU for every additional foot of ceiling height.

Q2: What about rooms with lots of windows?
A: For sun-facing rooms or those with large windows, consider increasing capacity by 10-20%.

Q3: Does insulation affect sizing?
A: Yes, poorly insulated spaces may need 10-30% more capacity, while well-insulated spaces may need less.

Q4: What are standard mini split sizes?
A: Common sizes are 9,000 BTU, 12,000 BTU, 18,000 BTU, 24,000 BTU, and 36,000 BTU.

Q5: Should I round up or down?
A: It's generally better to round up to the next available size if your calculation falls between standard units.