The Importance of Primary Energy in Passive Houses

A report that came out in Belgium looked at 274 passive houses. Half of those houses had MVHR And the other half had a demand control ventilation system. The heat recovery, not unsurprisingly, was more efficient I believe it was around 6% energy saving on the heating so that's good So that was a win for MVHR When they looked at the primary energy It was five times the usage Sorry, five times the Usage for MVHR andPrimary energy means What it actually costs, how much power is that unit consuming? "It would cost you 350 euros a year more To run in VHR With no seeming benefit of indoor air quality Which is the whole reason that you're putting that system in