Insulation savings calculator
Compare insulation scenarios for a surface using U-values and heating degree days. Save alternatives to set priorities.
Calculation inputs
Editable example. Replace prices and assumptions with your project data; these are not verified rates or a quote.
Project
ProjectYou can calculate. The cloud project is unavailable; this form draft can only be recovered on this device.
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Indicative result
- Reduction in heat loss
- 4,320 kWh / year
- Simple payback
- 18.52 years
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How it is calculated
Reduction in heat loss = ( Current U-value (W/m²K) − Improved U-value (W/m²K) ) × Surface to insulate (m²) × Heating degree days (K·day/year) × 24 / 1000
Indicative result = Reduction in heat loss × Useful heat cost (€/thermal kWh)
Simple payback = Installed investment (€) / Indicative result
What to check
Only transmission losses through the selected surface: excludes thermal bridges, ventilation, moisture and cooling. Use local degree days and useful-heat cost per kWh.
Simplified annual model: no grants, financing, tariff changes or degradation. Does not replace a building energy assessment.
Sources and references
IDAE · EdificaciónReviewed:
Frequently asked questions
Is this a final quote?
No. Results depend on your inputs and the stated scope. A professional must check the property, measurements and conditions before quoting.
Can I use measurements from my plan?
Renovation, radiator, cooling and materials calculators can use internal plan measurements. Enter built area and the thermal envelope separately. You can save scenarios in your project.
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