Heat recovery
The recovery unit transfers heat from extract air to supply air. The efficiency is stated by the manufacturer and is the decisive figure for what you save.
All energy measures
Building envelope
Balanced ventilation
A balanced system extracts stale air and recovers the heat from it before it leaves the house. The airtighter the home, the more the system has to work with.
See what this means for your homeThis measure is relevant if
- The home has been sealed or insulated, and the air feels stale
- There is condensation on windows, or damp in bathrooms and kitchen
- You open windows in winter to get fresh air
- The house is being fully renovated, so ducts can be concealed
What it does to energy use
Less loss from airing
Opening a window throws out heated air. A balanced system gives the same air change without that loss.
The system uses electricity itself
The fans run around the clock. The net gain is recovered heat minus fan energy, which makes the specific fan power as important as the recovery efficiency.
Moisture control
Steady air change removes moisture from bathrooms and kitchen and lowers the risk of condensation inside the structure.
Sequence matters
Balanced ventilation belongs with sealing the building envelope, and comes after it. In a leaky house much of the air bypasses the system and the recovery unit has less to work with — you pay for an efficiency you never reach. Seal first, ventilate after, and run the ducts while walls and ceilings are open anyway.
Enova funding
Balanced ventilation with heat recovery is among the measures Enova funds. The terms have set requirements for the system's recovery efficiency.
Rates and terms change. What you can receive depends on the building, how the work is carried out and which schemes apply at the time. Always check Enova's own pages before relying on a figure.
The rates tell you what you can receive. The calculation tells you what the measure actually does to your home — how much it saves, what it costs, and whether it should come before or after the others.
Which measures pay off in your home?
Enter the address. Gadder collects what is known about the building, calculates the energy demand and ranks the measures by what they actually deliver.