Methodology
CostCandid Methodology
CostCandid helps U.S. households understand what home equipment, appliances, energy use and household upgrades may actually cost over time.
Our goal is not to provide one universal price. Costs vary by home, location, utility rate, equipment, usage and installation conditions.
Instead, CostCandid uses transparent calculations, editable assumptions and publicly available data so readers can understand what drives the result and replace our assumptions with numbers that better match their own situation.
How CostCandid Builds Cost Estimates
Most CostCandid comparisons follow the same basic process:
- Define the financial question being answered.
- Identify the variables that materially affect the result.
- Use authoritative public data where appropriate.
- Separate sourced data from illustrative assumptions.
- Show the calculation or provide an editable calculator.
- Compare alternatives over a relevant ownership period when appropriate.
- Explain factors that can cause a household's actual result to differ.
Our Primary Data Sources
CostCandid prioritizes primary and authoritative sources whenever they are appropriate for the question being analyzed.
Depending on the topic, these may include:
- U.S. Energy Information Administration (EIA)
- U.S. Department of Energy (DOE)
- ENERGY STAR and the U.S. Environmental Protection Agency (EPA)
- Federal, state and local government programs
- Utility documentation
- Manufacturer specifications and product documentation
Individual articles identify the sources relevant to that specific calculation or comparison.
Electricity Cost Calculations
For appliances and equipment where power consumption is known, a basic electricity-cost calculation may use:
Power (kW) × Operating Time (hours) = Electricity Use (kWh)
and:
Electricity Use (kWh) × Electricity Rate ($/kWh) = Electricity Cost
When an appliance's annual energy consumption is available from an authoritative product specification or standardized test, CostCandid may instead use:
Annual Energy Consumption (kWh) × Electricity Rate ($/kWh) = Estimated Annual Electricity Cost
These approaches answer slightly different questions. Rated wattage, standardized annual consumption and actual measured household electricity use should not automatically be treated as interchangeable.
Electricity Rates
Some CostCandid calculators use a U.S. residential electricity price published by the U.S. Energy Information Administration as an illustrative default.
The applicable month and data source should be identified in the individual article.
A national electricity price is not intended to represent every household. Electricity rates can vary substantially by state, utility, rate plan and time period.
Whenever possible, readers should replace the default with the electricity rate shown on their own utility bill.
Water and Sewer Cost Calculations
When water consumption is relevant, CostCandid may estimate direct water and sewer cost using:
Gallons Used ÷ 1,000 × Combined Water and Sewer Rate = Estimated Water/Sewer Cost
Water and sewer pricing structures vary widely. A calculator default may therefore be an illustrative assumption rather than a national average unless the article specifically identifies it as sourced data.
Purchase Price and Installation Cost
Equipment and installation prices can vary substantially by product, contractor, home configuration and location.
CostCandid does not treat a single online price or contractor quote as a universal U.S. price.
Where price ranges are discussed, the article should explain the source or basis of those estimates. For calculators, example purchase or installation costs may be used to demonstrate how the calculation works.
For an actual purchase decision, readers should replace illustrative figures with current product prices or written local quotes whenever possible.
Total Cost of Ownership
Purchase price alone does not always identify the less expensive option.
When appropriate, CostCandid evaluates costs over multiple years using a structure such as:
Upfront Cost + Operating Cost + Maintenance + Expected Replacement Cost = Estimated Ownership Cost
The exact components vary by topic.
For example, an appliance comparison may focus primarily on purchase price and utilities, while an HVAC or home-electrification project may also require installation, electrical work, maintenance or other project costs.
Simple Payback
When one option costs more upfront but may reduce ongoing expenses, CostCandid may calculate a simple payback period:
Additional Upfront Cost ÷ Estimated Annual Savings = Simple Payback Period
Simple payback is a decision-support tool, not a complete investment valuation.
Unless an article specifically states otherwise, simple payback calculations do not automatically include inflation, financing costs, discount rates, taxes, future utility-price changes or resale value.
Illustrative Assumptions vs. Sourced Data
This distinction is central to the CostCandid methodology.
Sourced data refers to information tied to an identified external source, such as an EIA electricity price, an ENERGY STAR efficiency requirement or a manufacturer specification.
Illustrative assumptions are example inputs used to demonstrate a calculation or provide a starting point for an editable calculator.
An illustrative assumption should not be interpreted as a national average, typical household result or guaranteed cost unless the article specifically provides evidence supporting that characterization.
Why Our Calculators Are Editable
Household costs are highly sensitive to individual circumstances.
Two homes using the same appliance can have different annual costs because of differences in:
- electricity prices
- operating hours
- climate
- equipment efficiency
- household behavior
- water and sewer rates
- home size and condition
- installation requirements
For that reason, CostCandid calculators are designed to let readers replace example assumptions with their own information whenever practical.
Standardized Ratings vs. Real-World Use
ENERGY STAR, DOE and manufacturer data can provide useful standardized measurements for comparing products.
Standardized ratings do not necessarily predict the exact energy consumption of a specific household.
Actual use can change because of climate, runtime, settings, maintenance, household behavior and building conditions.
CostCandid therefore uses standardized data as a comparison tool while distinguishing it from measured real-world household consumption whenever that distinction matters.
How We Handle Uncertainty
Long-term household cost estimates involve uncertainty.
Future electricity prices, equipment life, repair costs, weather, household usage and replacement prices cannot be known precisely in advance.
CostCandid therefore favors transparent assumptions over false precision.
Where uncertainty materially affects the decision, readers are encouraged to test multiple scenarios rather than rely on a single calculated result.
Updates and Data Dates
Energy prices, efficiency standards, rebates, tax incentives, product specifications and installation costs can change.
Articles involving time-sensitive data may identify when the underlying information was checked.
Readers should verify current program requirements, incentives, product specifications and local prices before making a financial or purchasing decision.
What CostCandid Calculators Do Not Provide
CostCandid calculators provide educational cost estimates and decision-support tools.
They are not contractor quotes, engineering analyses, energy audits, financial advice or guarantees of future savings.
Actual project requirements should be confirmed with the appropriate utility, manufacturer, qualified contractor or other relevant professional when necessary.
Our Editorial Principle
CostCandid starts with a simple question:
What does this decision really cost?
We try to answer that question by separating purchase price from operating cost, short-term cost from long-term ownership cost, and sourced facts from assumptions.
The objective is not to tell every household to make the same choice.
It is to make the financial trade-offs visible enough for readers to make a better-informed decision using their own numbers.
