Heating Cost Estimator

Calculation Method

The estimator uses a simplified heat-loss model based on four key factors:

1. Heat loss rate – Based on home size and insulation quality, measured in BTU/hr per degree of temperature difference (BTU/hr/°F).
2. Heating Degree Days (HDD) – A climate metric reflecting how cold a location is. More HDD means more heating required. For example, Chicago has ~6,500 HDD/year while Miami has ~200.
3. Heat required = Heat loss coefficient × HDD × 24 hours (in BTU per season).
4. Fuel consumed = Heat required ÷ (fuel BTU content × system efficiency).
5. Cost = Fuel consumed × fuel price, divided across heating months.

Insulation Factors

The heat loss coefficient (BTU/hr per ft² per °F) varies by insulation level:

• Poor: Older homes with no insulation upgrades, single-pane windows, drafty.
• Average: Standard construction with basic insulation in walls and attic.
• Good: Upgraded insulation, double-pane windows, weatherstripped.
• Excellent: New builds or deep retrofits with high R-value walls, triple-pane windows, air-sealed.

Climate Zones

Based on IECC climate zones used across the US, each zone corresponds to a range of annual Heating Degree Days. Colder zones have significantly higher heating demands.

Important Notes

• This is an estimate based on simplified assumptions. Actual costs depend on home geometry, window area, air leakage, and local weather patterns.
• Heat pump efficiency (COP) varies with outdoor temperature – quoted efficiency is a seasonal average.
• Thermostat setback (lowering temperature when away or sleeping) can reduce costs 5–15%.
• Fuel prices vary significantly by region and season.

You can embed this util on your own site as a widget. Adding ?embed=1 to the URL loads a compact version with just the tool itself; no header, menu, or documentation. Paste this snippet into your HTML:

Copy snippet Adjust the height to taste.