1. What is the Home Furnace Calculator?

The Home Furnace Calculator estimates the required furnace size in BTU/hr based on your home's square footage and local climate conditions. Proper furnace sizing is essential for efficient heating and comfort.

2. How Does the Calculator Work?

The calculator uses the furnace sizing formula:

Where:

• \( Sq ft \) — Total square footage of living space (ft²)
• \( Climate factor \) — BTU per square foot based on climate zone (30-60 BTU/ft²)

Explanation: The formula calculates the heating capacity needed based on home size and regional climate characteristics.

3. Importance of Proper Furnace Sizing

Details: Correct furnace sizing ensures optimal energy efficiency, consistent comfort, proper humidity control, and extends equipment lifespan. Oversized furnaces short-cycle while undersized units run constantly.

4. Using the Calculator

Tips: Enter total heated square footage and select appropriate climate factor (30 for mild climates, 60 for very cold climates). All values must be valid (square footage > 0, climate factor 30-60).

5. Frequently Asked Questions (FAQ)

Q1: What climate factor should I use?
A: Use 30-40 for mild climates (Southern US), 40-50 for moderate climates (Midwest), and 50-60 for cold climates (Northern US/Canada).

Q2: Does this include basement and garage space?
A: Only include heated living spaces. Exclude unheated areas like garages, unfinished basements, and attics.

Q3: What about home insulation quality?
A: This calculator provides a basic estimate. Poor insulation may require higher climate factors, while excellent insulation may allow for lower factors.

Q4: Should I round up the calculated BTU?
A: Yes, it's common practice to round up to the nearest standard furnace size available from manufacturers.

Q5: Is professional assessment recommended?
A: For precise sizing, consult an HVAC professional who can perform Manual J load calculations considering all factors.