Free Online Calculator

How much are you overpaying for heating?

Find out how much money you lose each year due to poor thermal insulation and how long it will take to pay off your building insulation

30-50%
heating savings
3-7 years
payback period
2 min
calculation time

The facade insulation calculator will help you select optimal insulation thickness, estimate heating savings, total project cost, and payback period. You'll immediately see how heat loss and energy bills change depending on the selected material.

The calculator models heat loss through building envelope based on the entered multi-layer wall structure.

🎯 Who will benefit from this calculator

Private homeowners, designers, and contractors who want to justify the budget, select rational insulation thickness, and forecast payback under real operating conditions.

Read to quickly understand how to use the calculator correctly

🏠 Step 1: Wall Area

Enter the total wall area you plan to insulate.

How to calculate:

  1. Measure wall height from foundation to roof
  2. Measure the length of each exterior wall around the perimeter
  3. Multiply height by length for each wall and add the values
  4. Subtract window and door areas

Example: House 10×8 m, height 2.7 m, windows and doors 15 m² → wall area: 2.7 × (10+10+8+8) - 15 = 82.2 m²

🌡️ Step 2: Heating Parameters

Enter desired indoor temperature and heating system efficiency or heat pump COP.

Efficiency examples for different heating systems:

  • Gas boiler: 0.8-0.92
  • Condensing gas boiler: 1.07-1.08
  • Electric heating: 0.95-0.99
  • Heat pump: COP per specifications (typically 2.5-4.5)
  • Solid fuel boiler: 0.7-0.85

💰 Step 3: Heating Tariff

Enter the cost of 1 kWh of energy in your local currency.

How to calculate:

  • Central heating:Your tariff is set per 1 Gcal of energy. Note that 1 Gcal = 1163 kWh
  • Gas heating:Tariff is set per 1 m³ of gas. Note that 1 m³ of gas ≈ 9.65 kWh of heat.
  • Electric heating:Your electricity tariff.
  • Heat pump: Divide electricity tariff by COP

Average 2025 tariffs: gas ≈ 1.13-1.15 UAH/kWh, electricity ≈ 2.62-4.32 UAH/kWh

🧱 Step 4: Wall Structure

Enter name, thickness, and thermal conductivity coefficient for each wall layer.

Thermal conductivity examples:

Main materials:
  • Reinforced concrete: 1.69
  • Ceramic brick: 0.47-0.56
  • Silicate brick: 0.52-0.7
  • Hollow brick: 0.35-0.47
Other materials:
  • Aerated concrete: 0.23-0.29
  • Wood: 0.09-0.23
  • Plaster: 0.47-0.58
  • Existing insulation: 0.03-0.05

🏗️ Step 5: Insulation Selection

Select insulation type and enter its parameters.

Insulation Type λ (W/m·K)
Expanded Polystyrene (EPS) 0.040-0.043
Extruded Polystyrene (XPS) 0.034-0.035
Mineral Wool 0.039-0.040

📅 Step 6: Heating Season

Enter heating season parameters for your region.

For each month enter:

  • Average outdoor temperature (°C): Average temperature for the month in your region.
  • Heating duration (days): Number of days in the month when heating operates.

Default data is set for central Ukraine. Adjust for your region using building climatology standards or regional weather data.

Important: For months without heating (typically May-September), set 0 days. For partial heating months, enter actual heating days.

📊 Results Interpretation

After clicking Calculate, you'll receive a table and chart with results:

  • Thickness (mm): Various insulation thickness options from 20 to 200 mm.
  • Annual energy savings (UAH/season): Money saved per heating season thanks to insulation.
  • Insulation cost (UAH): Total material and labor cost for given insulation thickness.
  • Payback period (years): Heating seasons needed to recover insulation investment.

How to choose optimal thickness:

  • Most economical option has shortest payback period
  • For maximum energy efficiency, choose thickness per thermal resistance recommendations for your climate zone.
  • Greater thickness means more savings but longer payback

Additional information: With significant tariff increases, payback period will decrease. Calculation uses current prices without inflation.

👨‍🔬 Need Expert Consultation?

For detailed interpretation and individual recommendations, contact the calculator author:

📞 Contact

🌐 ykovalenko.com — calculator author's personal website

📊 Insulation Calculation: Enter Building Parameters

1 Parameters
2 Wall
3 Climate
4 Insulation
🏠 Step 1: Basic Building Parameters
🧱 Step 2: Wall Structure
Material Name Thickness (m) Thermal Conductivity λ (W/m·K)
🌡️ Step 3: Heating Season Climate Data
Period Average Temperature (°C) Heating Duration (days)
📦 Step 4: Insulation Parameters