1. What is a Mini Split AC BTU Calculator?

Definition: This calculator estimates the cooling/heating capacity (in BTU/h) needed for a mini-split air conditioning system based on room size and other factors.

Purpose: It helps homeowners and HVAC professionals determine the appropriate size of mini-split AC unit for a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required cooling/heating capacity (BTU/h)
• \( A \) — Room area (square feet)
• \( \text{BTU/ft}^2 \) — Cooling load per square foot (typically 20-30 BTU/h·ft²)
• \( F \) — Adjustment factor for room conditions

Explanation: The base BTU requirement is calculated from room area and standard cooling load, then adjusted for specific room conditions.

3. Importance of Proper Sizing

Details: Correctly sizing a mini-split AC ensures energy efficiency, proper dehumidification, and system longevity. Oversized units short-cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Enter the room area in square feet, BTU/ft² (default 25), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: For cooling, typically 20-30 BTU/h·ft² (25 is average). For heating in cold climates, use 30-40 BTU/h·ft².

Q2: When should I adjust the factor?
A: Increase factor for: sunny rooms (1.1-1.3), kitchens (1.2-1.4), or high ceilings (1.05-1.2). Decrease for shaded rooms (0.9).

Q3: How do I measure room area?
A: Multiply length by width of the room. Include adjacent open spaces if not separated by doors.

Q4: Does this account for insulation?
A: No, adjust BTU/ft² or factor accordingly (better insulation = lower BTU/ft²).

Q5: What about room height?
A: For ceilings > 8 ft, multiply area by (height/8) or increase the adjustment factor.