In question of Passivehaus

[S-F]

EnerPHit

We already have many older houses. When should we give up and call the bulldozer? Is 0.6 ACH@50 actually going to save you ANY money at all? Or maybe cost more than you'll save over a thousand years? I'm being quite serious with the thousand year remark. I constantly do ROI calcs and for anything real serious we're usually talking about a time span which is MUCH longer than the usual human life. In a retrofit do you drop over 100K to only get CLOSE to PHI standards or do spend 50K or less and "simply" go with "absolutely fantastic"?

My personal opinion is that PHI standards are an absolutely great goal. Just don't beat yourself up when you can't make them. It's honestly pretty hard to get below 1ACH 50 in new construction. It can be done ...... but you have to be OK with using tapes and foams which aren't going to last 50 or 100 years. In 30 years your passivehaus is at 1.7 ACH@50. But you did get to have the PH inspector come and give his seal and you also did get to pay for it.