1. What Are Cooling Degree Days?

Cooling Degree Days (CDD) measure the need for air conditioning based on outdoor temperatures. They quantify how much and for how long the outside temperature is above a specified base temperature, indicating cooling energy demand.

2. How Does the Calculator Work?

The calculator uses the CDD formula:

Where:

• \( Base Temp \) — Reference temperature (typically 65°F)
• \( Avg Daily Temp \) — Average daily temperature
• \( ^+ \) — Only positive differences are counted

Explanation: The calculation sums only the positive differences between base temperature and average daily temperature over a specified period.

3. Importance of CDD Calculation

Details: CDD values help estimate energy consumption for cooling, plan utility budgets, analyze climate patterns, and assess building energy efficiency. They are widely used in energy management and climate studies.

4. Using the Calculator

Tips: Enter base temperature in °F (typically 65°F) and average daily temperature in °F. The calculator will compute the cooling degree days for a single day. For longer periods, sum daily CDD values.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard base temperature for CDD?
A: 65°F is commonly used, but it can vary based on building type, insulation, and regional climate conditions.

Q2: How are CDD used in energy forecasting?
A: Utility companies use CDD to predict electricity demand for air conditioning and plan power generation accordingly.

Q3: What's the difference between CDD and HDD?
A: CDD measures cooling demand (temperatures above base), while HDD (Heating Degree Days) measures heating demand (temperatures below base).

Q4: Can CDD be calculated for different time periods?
A: Yes, CDD can be calculated daily, monthly, seasonally, or annually by summing the daily values.

Q5: Are there limitations to CDD calculations?
A: CDD doesn't account for humidity, solar radiation, or building-specific factors, so it provides a general estimate rather than precise energy consumption.