News
The Heat Loss app has been updated, adding a function has been added to insert rooms from an image file with a schedule.
13.06.2026
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A version of the HVAC Calculator has been created for mobile browsers on Android and iOS.
09.01.2026
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All online applications have been updated and now have a dark theme.
04.01.2026
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To select an optimal heat pump, you need to know the cost of operating a
heat pump per year.

With the help of this tool you can determine the cost of electrical power consumed by the heat pump per year and compare it with other sources of heat, for example:
gas boiler, electric boiler or solid fuel boiler.
Multiple calculation parameters
  • Selection of calculation purpose for heating, ventilation, hot water supply.
  • Select the type of heat pump with or without electric heater.
  • Select the number of electricity tariffs: one or two.
  • Select the ventilation operation period and hot water supply per day.
  • Heating pattern of hot water supply with or without priority.
  • Determination of the bivalence point.
Savings from double tariff for electrical power
You can choose a single or double (day and night) tariff for electrical power and see the cost savings due to the use of a double tariff.
CO2e emissions
See CO2e emissions from the electricity consumed by the heat pump and compare them with emissions from burning natural gas, solid fuel or liquid fuel.
Detailed reports
  • Report in Excel file with all parameters.
  • Bivalent temperature chart.
  • Heat performance chart.
  • Heat provided chart.
  • Average COP chart.
  • Electrical power consumption chart.
  • Energy carrier cost diagram.
Unique method of calculation

Climatic data of outdoor air temperature for each day of the calculation period are used.

The calculation is performed for each day of this calculation period, on average it is about 5000 calculations for one city, from which the average maximum accurate result of the calculation is obtained.
Video review
Just watch video and start working.