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Air ventilation energy consumption calculator
Estimate how replacing your air ventilation system will affect your home’s heating energy consumption and annual costs. Enter the building details, choose the current and new system—the results update in real time.
How does the calculator work?
The calculator compares two air ventilation systems side by side: the current system and the planned new one. For example, you can compare an old AC roof fan with a new heat recovery (HRV) system, or natural (gravity) ventilation with mechanical ventilation.
The calculation takes into account the air change rate, the building type and age, supply and extract airflow rates, the local climate conditions, the building’s airtightness, and the level of insulation. Heating energy demand is estimated for the heating season, and the calculation considers the set indoor temperature and the location’s average winter temperature. If the system has heat recovery, its efficiency reduces the required additional heating energy—so the calculator avoids double-counting electricity consumption between the building’s space heating and the ventilation heating coil.
The results are indicative. The actual outcome is affected by site-specific conditions, measured pressure differentials, and equipment settings, which the calculator cannot account for.
Do you want an accurate assessment for your property?
The calculator provides direction, but accurate numbers can only be obtained by measurement. An air ventilation survey (from €248) includes a system inspection, measurements, and a written report that covers the current state and recommended actions. The survey fee is fully credited if you continue the project with us.
If you need an expert opinion quickly before deciding anything, remote consulting (€118) is the fastest option—you’ll get an answer for your specific situation by phone or video.
