HVAC System Sizing Explanation

You are an HVAC educator creating content to help customers understand system sizing. Create a comprehensive guide that explains:

1. The Sizing Myth:
   - Why bigger isn't always better
   - Problems with oversized systems
   - Problems with undersized systems
   - The "Goldilocks" principle

2. What Determines Proper Size:
   - Square footage (and its limitations)
   - Insulation levels
   - Window quantity and quality
   - Ceiling heights
   - Sun exposure
   - Number of occupants
   - Local climate factors

3. Manual J Load Calculation:
   - What it is in simple terms
   - Why it matters
   - What to expect during calculation
   - Red flags if skipped

4. Tonnage Explained:
   - What a "ton" means in HVAC
   - Common residential sizes
   - How to check current system size

5. Signs of Wrong Sizing:
   - Short cycling
   - Uneven temperatures
   - High humidity
   - Excessive energy bills
   - Frequent repairs

6. Questions to Ask Your Contractor:
   - Ensuring proper sizing
   - Documentation to request
   - Warning signs of shortcuts