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4.3.1 Compressor head reduction reduces the pumping effort required by the compressor which is accomplished either by raising chilled water temperature or by lowering condensed water temperature. Reducing condensor waste in, or chilled water out, will save about 1.5 to 2 % compressor motor energy per one deg .F of change.
4.3.2 Using Control Logic for chilled water reset and condenser water reset.
4.3.3 Controlling chiller electric demand through shutdown of selected, non - critical air handlers using chilled water and limiting the opening of suction inlet wanes.
4.3.4 Chiller sequencing and local control is used in plants having multiple chillers. Independent on type or size there is an optimum combination of chillers, pumps and towers for each increment of plant loads.
4.3.5 Methods like reducing chiller energy by rehabilitation, free cooling cycles, chilled water main revisions and spot cooling might be used depending on plant conditions.

4.4 Boiler Controls：

Boiler generates steam or hot water for the consumption for space heating, air handlers, domestic water and various processes. Three main fue1 conservation opportunities could be exploited through proper controls.
4.4.1 Improvement of combustion efficiency. This is done through fuel automizing & mixing with combustion air, Air – Fuel ratio adjustment, control of stack temperature and flue gas composition.
4.4.2 Reduction of losses: External to the Combustion Chambers to achieve this the considerable steps are : Preheating combustion air and feed water with flue gas; Installation of dampers to prevent off-cycle stack loss ; Drawing combustion air from hottest point within the room and putting extra insulation in some specific areas.
4.4.3 Better control of the furnace I Boiler: Burners are retrofitted to achieve better atomization and mixing of air and fuel. This ensures complete combustion, less soot / smoke, less cleaning and better efficiency. Moreover closer control in spaces without wasteful overshooting of desired control point will help in cost control.

4.5 Lighting Levels & Lighting Controls:

Lighting levels can be reduced to an appropriate level consistent with the use of that particular space like 50 foot candles at occupied workstation; 30 foot-candles in work areas and less than 10 foot candles in areas such as hallways and corridors.
Lighting Control is done in various forms like lights on only when and where necessary automatic switching with local overrides, modulating the amount of light provided to an area through use of special type of sensors combined with a computerized building automation system
Other steps like reducing the cooling load and selecting efficient light sources could also be considered.