Insulation/ CALCULATOR
Insulation heat and energy savings
Screen the annual transmission-heat, purchased-energy and cost reduction from improving one building element.
Use the net wall, roof or floor area represented by both U-values.
Include the whole existing assembly, not only the insulation layer.
Use the proposed whole-assembly value including thermal bridges where available.
Use a local long-term value with the base temperature stated by its source.
Use seasonal efficiency for a boiler or seasonal performance factor for a heat pump.
Enter a comparable all-in marginal price in one currency.
Transmission heat saved
7,776 kWh/year
Purchased energy saved
8,640 kWh/year
Estimated annual cost saving
1,296 currency/year
U-value reduction
75.0 %
Interpretation:This scenario saves 8,640 kWh of purchased energy and about 1,296 cost units per year. Compare several assumptions before using it for a budget.
Steady one-dimensional transmission represented by the entered whole-element U-values and heating degree-days. Indoor setpoint, solar and internal gains, wind, air leakage, thermal bridges, moisture, system cycling, rebound, cooling and tariff changes are not modelled separately. This is a comparison screen, not an energy certificate or investment guarantee.