1. What is the Ducted AC Size Calculator?

This calculator helps determine the appropriate size for a ducted air conditioning system based on your home's square footage, age, and roof color. Proper sizing is crucial for efficiency and comfort.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Area \) — Square footage to be cooled
• \( Factor \) — BTU per square foot (20-30 range)

Factor Adjustments:

• New homes (0-10 years): Base factor 20
• Medium age (11-25 years): Base factor 25
• Older homes (26+ years): Base factor 30
• Light roof: -2 from base factor
• Medium roof: No adjustment
• Dark roof: +3 to base factor

3. Importance of Proper AC Sizing

Details: An oversized AC will short cycle, reducing efficiency and comfort. An undersized unit will run constantly without properly cooling. Both scenarios lead to higher energy bills and reduced equipment lifespan.

4. Using the Calculator

Tips: Measure your home's square footage accurately. Consider your home's insulation quality - this calculator assumes average insulation. For homes with exceptional or poor insulation, consult an HVAC professional.

5. Frequently Asked Questions (FAQ)

Q1: Why does roof color matter?
A: Dark roofs absorb more heat, increasing cooling load by 10-15%. Light roofs reflect more sunlight.

Q2: What about windows and insulation?
A: This calculator provides a general estimate. Window quantity/quality and insulation levels significantly impact cooling needs.

Q3: What's the conversion from BTU to tons?
A: 12,000 BTU/h equals 1 ton of cooling capacity.

Q4: Should I round up to the nearest ton?
A: Generally yes, but consult an HVAC professional as oversizing by more than 15% is not recommended.

Q5: What about multi-story homes?
A: For multi-level homes, calculate each floor separately and consider a zoned system.