AI: 9ppm is the maximum safe level. 800ppm is fatal. With traditional house methods, the cross-ventilation etc was as much to manage humidity. CO kills in a modern sealed house with little ventilatio… (View Post)

(nerd ON) There are lots of ways round that, depending. Local water heater at the bathroom, as we get for eg electric showers. Local water storage (small tank). Hot water circulation system (large ho… (View Post)

The premium for building a passive house over a "normal" house is in the low single-figure percentage points. @Benpointer may have up to date numbers. I'll have a lookout for mass buil… (View Post)

That's about right (imo, in case someone disagrees!). A was selected as the "best practical cost-effective balancing cost of retrofit vs savings in bills" level that could be reached b… (View Post)

I read that as age-groupie. ie Gerontophiles. Leon, Leon, wherefore art thou Leon? (View Post)