Temperatures are high, but these techniques will help you keep your energy costs low:

1. Reduce HVAC System Operations When Building or Space is Unoccupied
1. Minimize direct cooling of unoccupied areas by turning off fan coil units and unit heaters, and by closing the vent or supply air diffuser
2. Turn fans off
3. Install system controls to reduce cooling/heating of unoccupied space
2. Minimize Exhaust and Make-Up Air
1. Keep doors closed when air conditioning is running
2. Properly insulate walls and ceilings
3. install thermal windows to minimize cooling and heating loss
3. Implement a Regular Maintenance Plan
1. Check fans for lint, dirt, or other causes of reduced flow
2. Schedule HVAC tune-ups (with us!) – the typical energy savings generated by tune-ups is 10%
3. Replace air filters regularly
4. Upgrade Fuel-Burning Equipment
1. Install turbulators to improve heat transfer efficiency in older fire tube boilers
2. Install automatic combustion control systems to monitor the combustion of exit gases and adjust the intake air for large boilers
3. Install electric ignitions instead of prior lights
5. Evaluate Boiler Operations
1. Investigate preheating boiler feed water
2. Adjust boilers and air conditioner controls so that boilers do not fire and compressors do not start at the same time but satisfy demand
3. Use hot water from boiler condensate to preheat air

source: http://infohouse.p2ric.org/ref/26/25985.pdf

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