" Air exchangers are required, muting the gains on efficiency" God not this again. Active ventilation in 2015 (actually, in 2005) has heat exchangers that reco

" Air exchangers are required, muting the gains on efficiency" God not this again. Active ventilation in 2015 (actually, in 2005) has heat exchangers that recoup most of the heat and do not nearly negate the efficiency advantages and improved comfort of a sufficiently air-tight house. Please review all the literature from the last 20 years which will tell you exactly this.