To all,
I am modeling a building in Colorado where there are many cool
nights/mornings in the summer. My building cools to 76deg 7am-5pm with a
unocc setback to 82deg. The designer is proposing an ECM where the HVAC
will bring in 100% OA from 4am to 7am for "free pre-cooling" to get the
building to the 76deg setpoint before the occupied temperature set point
kicks in. This should save a buch of cooling energy that would be needed
to bring the building to 76deg at system start up. This will only happen
when the outside temperature is favorable. I have air side economizers
set up, but I think they will only cool the building to 82deg from
4am-7am (am I correct?).

Thanks again,
Jacob Goodman