In the 90’s we installed leaky windows in new HUD affordable housing. At prevailing wage, it was $75-80k per dwelling unit.
Since then, we upgraded to super tight vinyl windows, QII insulation procedures, blower testing, etc.
The units began to experience indoor air quality problems because they were so airtight, so now we have upgraded to continuous running whole-house bathroom fans, multi-sp-ed with motion and humidity sensors. And because we can’t rely on people to open the window for fresh air, we’ve punch a whole in the exterior wall and installed an OSA intake.
Units now cost $500-880k apiece.
Did I mention that the bath fans have to be equipped with a switch and a sign that says some thing like “shut off only during poor quality outside air”?
I dunno, maybe we could just revert back to low-tech leaky windows and build a few more affordable housing units instead?