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Energy Efficiency Formula:
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Energy efficiency of a house measures how effectively the building utilizes energy inputs by comparing heat loss to heat input. It provides a percentage value representing the proportion of input energy that is effectively used rather than lost.
The calculator uses the energy efficiency formula:
Where:
Explanation: The equation calculates the percentage of input energy that is effectively utilized by subtracting the proportion of energy lost from the total input.
Details: Calculating energy efficiency is crucial for assessing building performance, identifying energy waste, improving insulation, reducing energy costs, and meeting environmental sustainability goals.
Tips: Enter heat loss and heat input values in kW. Both values must be positive numbers, and heat loss cannot exceed heat input for valid calculation.
Q1: What is considered good energy efficiency for a house?
A: Generally, energy efficiency above 80% is considered good, with modern well-insulated homes achieving 85-95% efficiency.
Q2: How can I improve my home's energy efficiency?
A: Improve insulation, seal air leaks, upgrade windows, use energy-efficient appliances, and install smart thermostats to reduce heat loss.
Q3: Does this calculation account for different energy sources?
A: The calculation is universal and applies to any energy source as long as heat input and loss are measured in consistent units (kW).
Q4: How often should I calculate my home's energy efficiency?
A: It's recommended to calculate energy efficiency seasonally or after major home improvements to track performance changes.
Q5: Are there professional energy efficiency assessments available?
A: Yes, certified energy auditors can provide comprehensive assessments using specialized equipment for more accurate results.