There are many vendors in this market. most offering viable energy savings measures, but generally not combined into a single strategy...
It is this combination and some administrative measures that can cut your net energy *use by 20 to 30%.
Done right however you can cut your electricity bill by nearly twice that due to 'demand charges' management.
Subcribe to my news letter for free access to news letters on this entire range of services. Fill in the information requested box with details of your particular needs in this aspect or if you wish to save money on a new system.
One option that I recommend is adapting new in the crates but surplus equipmant, major brands such as Carrier, Trane, Frick, York, Mycom and others... reducing you costs considerably,