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Energy Tips

Commerical Energy Tips

Explore ways to save money.

Managing your energy use wisely can help your business increase productivity, keep your customers and employees comfortable and reduce your utility costs.

Quick Guide to Efficiency

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  • Adjust thermostats. Turn down the building's heating thermostat and turn up its cooling thermostat, especially when the building is not occupied. No Cost.
  • Reduce the hot water temperature. Dialing back your water heater can decrease heat loss from your tank. No Cost.
  • Install water flow restrictors and aerators in sink faucets. These measures can save you money by reducing your use of hot water. Low Cost.
  • Reduce lighting. Remove lamps where you have more lighting than you really need, but be sure to maintain safe lighting conditions for work areas. Turn lights off when they're not in use. No Cost.
  • Seal heating and cooling ductwork. Leakage from areas such as joints, elbows, and connections can be substantial - as much as 20% to 30%. Leaks can prove especially costly if the ducts travel through unheated or un-cooled spaces such as attics, basements, or crawlspaces. Low Cost.
  • Wrap the hot water tank with jacket insulation. This simple, inexpensive measure will reduce standby heat loss from the tank. Be sure to leave the air intake vent uncovered when insulating a gas water heater. Low Cost.
  • Replace air filters regularly and follow maintenance schedules for furnace and air-conditioning equipment. Replacing a dirty air filter can save money by reducing the amount of electricity needed to run a blower motor. (A clean filter offers less resistance to airflow) Low Cost.
  • Install programmable thermostats. These inexpensive devices, most incorporating modern microprocessor-based electronics, can help optimize your building's heating and cooling needs. And you won't need to remember to change thermostat settings every time you open or close your business. Low Cost.
  • Install automatic room-lighting controls. These devices help optimize lighting use by automatically turning lights on or off, depending on occupancy or time of day. Sensors and timers work well and are usually installed by a specialist. Low Cost.
  • Clean heat exchangers and perform routine maintenance on refrigerating equipment. These simple measures will ensure the most efficient operation of heat exchangers needed for cooling or refrigerating equipment. No Cost.
  • Seal off unused areas and don't heat or cool these areas. Storage areas represent a good place to start; turn off heating and cooling to these areas. No Cost.
  • Turn off machines and equipment when not needed. In many businesses, this simple approach can achieve big savings. Don't underestimate the energy savings you can get by turning off unused computers, monitors, printers, and copiers. No Cost.
  • Buy energy-efficient equipment. When buying or replacing computers, copiers, and other office equipment, compare energy requirements of various models. Low Cost.
  • Seal exterior cracks and holes, and ensure tight-fitting windows. Seemingly small cracks or holes in the building exterior (like walls, windows, doors, ceiling, and floors) can really add up to substantial heating or cooling losses. Install weather stripping and caulking to stop these air leaks. Low Cost.
  • Shade sun-exposed windows and building walls. In most areas of the country, direct sunlight streaming through windows at the wrong time of the year can substantially increase your air-conditioning costs. During the cooling season, use shading methods (like window coverings, awnings, trees, and bushes) wherever possible. Low Cost.
  • Repaint building exterior with light colors. When it's time to repaint the exterior of your building, consider using light colors. More sunlight will be reflected away from the building, thus lowering air-conditioning expenses-perhaps your largest energy expense. This is especially true for your roof. Low Cost.
  • Keep exterior doors closed as much as possible. Don't heat or cool the outdoors. No Cost.
  • Block and insulate unneeded windows and other openings. Aside from the important security benefit, covering unneeded windows and doors can greatly reduce energy losses from these openings. Low Cost.
  • Encourage employees to be energy conscious. The importance of employee cooperation shouldn't be underestimated; their practices and activities can make or break your energy efficiency strategy. Consider offering incentives for employees who save the most energy. No Cost.

Motors

Use Premium Energy Efficient Motors

Consider purchasing premium energy-efficient motors when installing new motors or replacing existing motors. Premium efficiency motors are 1 to 4 percent more efficient than motors meeting federal minimum efficiency standards. Because many motors operate 40 to 80 hours per week or more, even small increases in efficiency can yield huge energy savings. Motors should also have the proper horsepower rating for the load - they should not be oversized.

Install Variable Frequency Drives

Variable Frequency Drives (VFDs) can be used with motors to help reduce energy costs. VFDs are electronic systems used to control motor speed by changing the frequency and voltage supplied to the motor. VFDs can result in substantial energy savings, especially for varying loads. Small reductions in motor speed can also yield substantial energy savings. For example, a 20 percent reduction in motor speed can reduce energy consumption by nearly 50 percent. Pump, fan and compressor systems with variable loads should be considered for retrofit with VFDs.

Replace V-belts with Cogged or Synchronous Belt Drives

Consider installing cogged or synchronous belt and pulley drive systems on motors using V-belt drives. Synchronous belts operate with less slippage and produce less heat than standard V-belts, which depend upon tension for power transmission. Lower tension also reduces motor load and bearing wear. The nominal efficiency rating for V-belt drives is about 93 percent over time (if not periodically re-tensioned).

Cogged belts can be used with the same pulleys as equivalently rated V-belts. They run cooler, last longer, and have an efficiency that is about 2 percent higher than that of standard V-belts.

Synchronous belts are toothed and require the installation of mating toothed-drive sprockets. They offer an efficiency of about 98 percent over a wide load range, require less maintenance and re-tensioning, and run slip free.

Check for Compressed Air System Leaks

Check your compressed air system for connection, hose, and seal leaks, which can substantially increase run time. Leaks waste energy and reduce equipment life. A compressor system specialist can perform a test that can detect even very small, silent leaks.

Refrigeration Equipment

Use Energy-efficient Motors in Refrigeration Equipment

Refrigeration equipment typically uses conventional, low-efficiency, shaded pole motors. When shopping for new units, look for refrigeration equipment with energy-efficient motors, such as split capacitor or electronically commutated motors. If you do not have plans to replace the refrigeration equipment anytime soon, consider replacing the shaded pole motors with more energy-efficient ones. Since refrigeration equipment operates 24 hours a day, your energy savings from this improvement can be substantial.

Clean Heat Exchanger Coils Regularly

Dirty heat exchanger coils can significantly affect the efficiency of your refrigeration equipment. Over time, these coils become clogged with dirt and dust, making the compressor work harder and consume more energy. Try to make annual cleaning of refrigeration coils part of your regular maintenance schedule.

Cleaning dirty refrigeration coils can save 25 percent in operation costs, and helps prevent early compressor failure. The dust build-up acts as an insulator, causing the refrigerator to work harder to keep food cool. The coils can be kept clean by using either a vacuum or a dust broom. Consult the owner's manual for specific cleaning instructions.

Chillers

Install High Efficiency Chillers

For many years, chillers used 1 to 1.5 kW per ton of cooling. However, chillers are now available that use only 0.48 to 0.8 kW per ton of cooling and contain refrigerants that do not damage the ozone layer. These high efficiency units are cost effective replacements for older chillers that are near the end of their useful lives, or even newer chillers that operate for most of the year. A chiller with a SEER of 15 — or its kW per ton approximate equivalent — can provide major savings on your cooling costs.

Implement a Variable Speed Drive for Your Chiller

Most chillers can operate down to 25 percent or even 15 percent of their rated capacity. However, their operating efficiency decreases significantly at these lower capacities. This means that cooling can be very inefficient in the spring and fall, when cooling loads are usually small.

This problem can be corrected by installing a variable speed drive on the chiller compressor motor. For chillers that are often run at part load, the savings can be significant. Variable speed drives regulate the frequency and voltage applied to a motor to control its speed and save it from unnecessary work, thus saving energy dollars.

Contact an air conditioning professional to evaluate the options applicable for your specific installation.

Install a Programmable Thermostat

By raising the thermostat setting during the summer just one degree, you could save up to 5 percent on your cooling costs. Keeping the daytime temperature up near the recommended 78 degrees will keep costs down. Additionally, you could turn the thermostat to 85 degrees or shut the HVAC system off when the building is not occupied. You also can:

  • Install a programmable thermostat, which allows you to automatically program temperature adjustments for both heating and cooling.
  • Set up a rigorous schedule that includes raising your thermostat as part of your daily routine.

Regularly Service Your Cooling System

Air conditioning systems typically lose one to two percent in efficiency for every year that passes without proper maintenance. This can lead to steady increases in your cooling costs. Proper maintenance should be performed at least once a year and should include:

  • Cleaning the condenser coils
  • Inspecting filters
  • Checking for correct discharge air temperature and proper refrigerant charge

You should consult the owner's manual for proper maintenance of your particular system.

Reduce Cooling Loads when Unoccupied

Consider reducing the use of your cooling system during hours that the building is unoccupied. The savings can be substantial. For example, setting the thermostat up to 90°F during the summer both at night and when the facility is not used could reduce your annual cooling costs by 10 to 15 percent.

  • Set up a schedule or make increasing the temperature on your thermostat part of your daily routine when leaving the facility.
  • When you start your air conditioner, do not set your thermostat at a colder setting than normal - your facility will not be cooled at a faster rate. A very cold setting could result in excessive cooling and add unnecessary operational expense.
  • Consider an automated timer or programmable thermostat for your air conditioner.

Replace Air Filters Every Season

Dirty and clogged air filters result block the flow of conditioned air and are the most common source of air conditioning service calls.

  • Filters are easy to replace and result in more effective air conditioning.
  • Check air filters monthly, and replace as needed.

Reduce Heating Load during Unoccupied Hours

Consider reducing the use of your heating system during hours that the building is unoccupied. The savings can be substantial. For example, setting the thermostat back to 50°F in winters at night and when the facility is not used could reduce your annual heating costs by 10 to 15 percent.

  • Set up a schedule or make setting back your thermostat part of your daily routine when leaving the facility. You may want to consider purchasing an automated timer control or programmable thermostat for your heating unit.

Select control equipment that is compatible with your existing system. Contact your electrician or heating contractor for installation.

Decrease the Temperature of Your Water Heater

Unless building codes demand a higher hot water temperature, try setting the thermostat on your water heater to 120°F. This will reduce your water heater's energy use and you won't even notice the difference. Also, consider that there is a chance of accidental scalding from higher temperatures. By lowering the temperature to 120°F, you greatly decrease this risk.

Install Time Clocks with Water Heaters

Water heaters are usually controlled only by temperature. When the temperature of the water in the storage tank drops below its set-point, the heater turns on until the water exceeds the set-point, even if the water is not used. Install a time clock to shut down the heater at close-of-business and to restart the unit to warm up just before hot water is again needed. A time clock can save unnecessary heating costs that include stand by losses (heat that is lost through the walls of the storage tank).

Install a Heat Pump Water Heater

An electric heat pump water heater presents a good opportunity for energy savings. Heat pump water heaters are extremely efficient alternatives to electric resistance style water heaters, often saving as much as 55 to 60 percent of water heating costs.

Turn Off Equipment when Not in Use

If copy machines or computers are not being used for extended periods of time, such as during lunch breaks or meetings, then some or all of the equipment can be turned off.

You can turn off your computer's display monitor and printer while leaving the main computer CPU on without any adverse effects on the equipment. This typically saves up to 60 percent of the operating costs of the whole computer system.

Be sure to turn off any equipment that is not used overnight, on weekends or during hours that the building is unoccupied. Assign an employee to the task, and/or post suitable reminder signage on the equipment.

Retrofit with T-8 Fluorescent Lighting

Retrofitting fixtures with T-8 lamps and electronic ballasts can reduce their electricity use by 30 to 40 percent, depending upon the configuration of the lamps. T-8 lamps and electronic ballasts also offer better color rendering characteristics, eliminate most light "flicker," and generate less heat than T-12 lamps. The reduction in heat also can provide significant savings in cooling costs.

Replace Incandescent Lamps with Compact Fluorescent Lamps

Replace indoor lighting fixtures using incandescent lamps with compact fluorescents, which consume 60 to 70 percent less energy and last about seven times as long as standard incandescent lamps.

When you replace your incandescent bulb with a compact fluorescent lamp (CFL), be sure to use a CFL that provides adequate light. A 15-watt CFL is usually appropriate for replacing incandescents up to about 60 watts. Use a 23-watt CFL for replacements up to 90 watts. For incandescent lamps over 90 watts, try a 28-watt CFL.

Retrofit with HID (High Intensity Discharge) Exterior Lights

Considerable energy savings can be achieved by using high intensity discharge (HID) fixtures for outdoor lighting. High pressure sodium lamps (which have a golden color) and metal halide lamps (which appear bluish white) offer significant energy savings over standard incandescent lamps. As an example, consider that a 32-watt metal halide lamp can replace an incandescent bulb in the range of 100 to 150 watts, thus saving over 50 percent in outdoor lighting costs.

Replace Mercury Vapor Lamps with Metal Halide Lamps

You can replace mercury vapor lamps with metal halide lamps using a ballast retrofit kit or a new fixture. A 100-watt metal halide lamp typically replaces a 175-watt mercury vapor bulb, thereby saving roughly 40 percent in outdoor lighting costs. Costs and savings will vary at your facility based on the specific wattages and usage of light fixtures (we have estimated that outdoor lights are used 8 hours per day).

Retrofit Your Exit Signs with Energy-efficient Light Sources

Buildings typically use incandescent lamps in their exit signs. Incandescent exit signs typically use two 20-watt lamps. While the wattage is not very high, these fixtures are on 24 hours a day. You can replace these incandescent signs with more energy-efficient alternatives, such as compact fluorescent lamps, light emitting diode (LED) units, or electroluminescent (EL) signs. Retrofit kits with either two 7-watt fluorescent lamps or a 2-watt LED unit produce light equivalent to the incandescent lamps. While LED lights are initially more expensive, they can last up to 80 years, reducing inventory and maintenance costs.

Use Fluorescent Lamps in Task Light Fixtures

Task lights, such as desk lamps, provide light where needed and allow you to decrease the amount of background light. Often, task lights use incandescent lamps. By replacing the incandescent lamps with compact fluorescents, you typically reduce energy consumption by 60 to 70 percent. In addition, heightening light levels in specific areas can reduce the need for ceiling fixtures and prevent eyestrain caused by overhead lights reflecting on computer monitors.

  • Task lighting provides light to the area where you directly need it, rather than lighting the entire surrounding area.
  • Typical uses of task lighting include overhead cabinets, office workstations, and exam rooms.
  • Desk and table lamps add flexibility because they can be easily moved to where they are needed.

Use Day Lighting on Peripheral Areas Exposed to Outside Light

If your facility has access to daylight, consider using a daylight dimmable electronic ballast and a photo-eye sensing control system to utilize daylight in peripheral areas of your business. These sensors and ballasts measure ambient daylight and modify the light levels accordingly. You can also take advantage of daylight by manually turning off lights when there is ample daylight in the workspace.