Ventilation Energy Consumption Calculator

With this tool, you can quickly estimate how replacing your ventilation system – for example, changing from an old AC roof fan to a new heat recovery ventilation (HRV) system – will affect your home’s indoor air quality, heating energy consumption, and annual energy costs. Simply enter the basic dimensions of the building, location, ventilation details, and any planned improvements, and the calculator will immediately show the differences between the current situation and the new solution.

 

The calculation is based on several background factors: air change rate, building type and age, supply and exhaust airflows, local climate conditions, building airtightness, and the level of insulation. Heating energy demand is estimated for the heating season and takes into account the set indoor temperature as well as the average winter outdoor temperature for the location. If the system includes heat recovery (HRV), its efficiency reduces the required additional heating energy, preventing double counting of electricity consumption between the building’s heating system and the ventilation unit’s heating coil.

 

The results are displayed in real time, so you can experiment with different settings and immediately see how they affect energy consumption, costs, and the air change rate. The calculator is intended to provide an indicative estimate and to support decision-making.