[Bldg-sim] Ashrae 90.1 99 vs 01 vs 04 vs 07

[Shaun Martin]

Hi all,

I'd like to get a better sense of how much more stringent Standard 90.1 has
become with each iteration. My (hearsay?) understanding was that a building
under 1999 required about 8% lower energy consumption to meet the standard
than 1989.  And I've heard the 2010 version is going to be 30% lower than
2001. Are these figures correct, and can anyone tell me how 01/04/07 fit in?

Thanks,
Shaun Martin
email smartin at shaunmartinconsulting.com