Share 'Trying to find %age energy saving from variety of upgrades in 10K sf multifamily house'

I'm trying to figure out %age of energy savings from a variety of upgrades in a 10,000 sf building that has had deferred maintenance and a disfunctional heating system. I'm using Energy Pro software and trying to figure out what the air flow reduction will be after adding insulation where there is none. The windows are mostly w/o hardware to keep them shut. The forced air system is nonfunctional…