Heating Degree Days Calculator

HDD Formula:

\[ HDD = 65 - T_{avg} \] (when \( T_{avg} < 65 \))

HDD (degree days):

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1. What is a Heating Degree Days Calculator?

Definition: This calculator estimates Heating Degree Days (HDD) based on the average daily temperature.

Purpose: It helps energy professionals and homeowners estimate heating requirements for buildings.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ HDD = 65 - T_{avg} \] (when \( T_{avg} < 65 \))

Where:

\( HDD \) — Heating Degree Days
\( T_{avg} \) — Average daily temperature (°F)

Explanation: When the average temperature is below 65°F, each degree below represents one heating degree day.

3. Importance of HDD Calculation

Details: HDD helps estimate energy consumption for heating, compare weather patterns, and analyze building energy efficiency.

4. Using the Calculator

Tips: Enter the average daily temperature in °F. The calculator will return 0 if temperature is 65°F or above.

5. Frequently Asked Questions (FAQ)

Q1: Why is 65°F used as the baseline?
A: 65°F is considered the temperature below which buildings typically need heating.

Q2: How do I find the average daily temperature?
A: Average the day's high and low temperatures, or use local weather station data.

Q3: What if my temperature is exactly 65°F?
A: The calculator will return 0 HDD, indicating no heating requirement.

Q4: Can I use this for multiple days?
A: This calculates for a single day. For multiple days, sum the daily HDD values.

Q5: What's the difference between HDD and CDD?
A: CDD (Cooling Degree Days) measures cooling needs when temperatures are above a baseline (typically 65°F).