— D —

Damper
A movable manufactured designed plate or louvers designed to open and close that regulate the air flow in a stove, chimney, furnace, or boiler. (residential | business)

Daylighting/Daylight pipes
Light tubes or pipes are usually installed in the roof of a home or the outside wall of a building and allow sunlight to reflect through the opening. A reflective material inside the tube directs the sunlight down the tube and with the help of a diffuser distributes it throughout your home or building. Some light tubes have directional collectors, also called reflectors, which assist in collecting additional directional light down the tube. (more)

DC Motor - Electrically Commutated
Electrically Commutated Motor, known as an ECM, is also called a brushless (BL) motor or brushless direct current (DC) motor. This type of DC electronic motor uses an electronic commutation system as it maintains a stationery magnet, or stator, in a constant polarity, while rotating magnet or rotor switches from north to south to south to north changing polarity to keep the rotor turning. It is powered by direct current and does not make use of brushes or any other type of mechanical commutator. (more)

Defroster- commercial freezer
Smart defroster kits can be added to walk-in refrigeration systems to help save energy and money. These defrosters decrease the amount of defrost cycles by 35-45% by defrosting the system only when necessary. (more)

Dehumidifier
A household appliance used to reduce the level of humidity in the air. (more)

Dehumidifier, desiccant wheel
Desiccant, a material (such as silica gel) that draws moisture out of the air and helps preserve dryness, is mounted in a rotating wheel in a building's HVAC system. It keeps a building comfortable and reduces air conditioning costs. (more)

Delamping
Delamping is defined as permanently removing or reducing the total number of light bulbs - properly called lamps - in fixtures throughout the building. Changing the lamps and the ballast of existing light fixtures to reduced wattage is a permanent delamping strategy. Retrofit kits may be needed to qualify for a delamping project. (more)

Demand response
Refers to shifting demand for electricity to non-peak periods or reducing electricity use during periods of peak demand.

Demand water heater
Tankless water heaters or demand type water heaters apply the same principle to heating water as standard gas and electric water heaters, but without a storage tank. They save energy by heating water only when needed, eliminating energy lost during standby operation, such as while you are on vacation. (more)

Denim Insulation
Denim clothing that once ended up in a landfill is now being recycled. It is cut into strips, imprinted with fire retardant (boric acid), combined with cotton fibers, and made into denim Insulation. The denim and cotton act as good insulators because of the looser structure, or breathability, of the fabric compared to tighter weaves. (more)

Desiccant cooling
Cooling indoor air in a business, commercial or industrial application by removing the humidity can improve comfort. Air dried by desiccants is typically cooled by an air conditioner or evaporative cooler. (more)

Desiccant wheel, dehumidifier
Dessicant, a material (such as silica gel) that draws moisture out of the air and helps preserve dryness, is mounted in a rotating wheel in a building's HVAC system. It keeps a building comfortable and reduces air conditioning costs. Some systems note a reduction in energy consumption of more than 60% compared to a standard air conditioning unit. (more)

Digital frames/Digital photo frames
Digital photo frames display photos in a slideshow format, usually with an adjustable time interval. Digital photo frames also offer an impressive opportunity for energy savings. (more)

Dimmable CFLs
A dimmable cold cathode fluorescent lamp, or CCFL, is older technology used for back-lighting the computer screen but is making its way into decorative and area lighting. Newer CCFL type bulbs have advantages such as being instant-on like an older traditional incandescent and have dimming capabilities. CCFLs are compatible with timers, photocells, and dimmers and they have a very long life expectancy. Dimmable CFLs are designed to work specifically in circuits or light fixtures with dimming capabilities. Dimming options help you choose the right light level while saving energy. (more)

Dimmable LEDs
The use of LEDs saves up to 75% over the traditional incandescent bulbs and LEDs in theory are fully dimmable, but be aware, some are not compatible with all dimmer switches. (more)

Dimmer switch
Using a dimmer switch for your lighting can be an effective way of reducing your energy consumption and may extend the life of your light bulbs. However, if you are using a CFL or an LED bulb, make sure you are using the right bulbs and the proper dimmer for your application. (more)

Direct current
Electricity that flows in only one direction in a circuit. Batteries use direct current electricity, also known as DC power.

Dishwasher
A dishwasher is a machine used to wash dishes and kitchen utensils automatically. Dishwashers with the ENERGY STAR® label use about 10% less energy and 20% less water than standard models. (more)

DNR
Department of Natural Resources is a government agency which includes the Division of Environmental Quality, the Division of Geology and Land Survey, the Division of State Parks, the Environmental and Energy Resources Authority and the Field Services Department. Learn more on the Department of Natural Resources website

Dock, leveler seal
An under leveler dock seal can be found along the bottom edge of a dock door, preventing rain, cold air, snow and dust from entering the building. A standard leveler may not give you an airtight seal, leading to heating and cooling losses, dirt and debris on the dock, and gaps where pests may enter the building. (more)

Dock lighting. LED
LED loading dock lighting may increase your light levels while potentially reducing the energy usage of your existing dock lighting. And with LED lamp life up to 50,000 hours, maintenance costs should decrease as well. (more)

Door, ENERGY STAR® certified
Certified doors with the Energy Star® label are more energy-efficient than other doors without the Energy Star® label. The energy performance ratings on doors tell the potential energy savings for gaining and losing heat as well as transmitting sunlight into your home. (more)

Drafts - home and building envelope
Drafts are openings or leaks in the structure of a home or building. These openings allow outside air to penetrate the walls, also known as the building envelope. These drafts allow cold outside air to come inside during the heating season. During the air conditioning season, they allow hot air to come inside. Leaks cause your heating and cooling equipment to run longer. These drafts, or energy wasters, result in higher heating and cooling bills. Finding these air leaks or drafts and sealing them will not only reduce your energy bill but will also increase the comfort level in your home or business. (more)

Dryer, clothes
A clothes dryer may be the second greatest energy-consuming appliance behind the refrigerator. Clothes dryers may use large amounts of energy, but energy costs can be reduced with some savings tips. (see clothes dryer or heat pump dryer)

Duct or Ductwork
A round or rectangle closed system used to move treated air from your furnace or air conditioning to other areas of your home or business. Traditionally, ductwork was made out of sheet metal, but more recently ducts are made from a variety of metals and polyurethane. (more)

Duct sealing

Moving air to and from each room throughout your home is an important part of your heating and cooling system. Leaking duct joints and fitting are found not only on old system but newly constructed systems as well costing you money by wasting energy. (more)

Ductwork fan
An in-line fan may provide a solution to noisy or in-effective bathroom fans, utility fans and range cook top fans. These fans can also provide an energy efficient method of controlled ventilation and boost air circulation. (more)


— E —

ECM (Electrically commutated motor)
Electrically Commutated Motor, known as an ECM, is also called a brushless (BL) motor or brushless direct current (DC) motor. This type of DC electronic motor uses an electronic commutation system as it maintains a stationery magnet, or stator, in a constant polarity, while rotating magnet or rotor switches from north to south to south to north changing polarity to keep the rotor turning. It is powered by direct current and does not make use of brushes or any other type of mechanical commutator. (more)

Electric baseboard heating
Electric baseboard heating converts nearly 100% of the electricity it uses into heat. However, according to the Department of Energy, using electricity as a fuel is often more expensive than heat produced using combustion appliances, such as natural gas, propane and oil furnaces. (more)

Electric car
A plug-in vehicle (PEV) has a battery which charges by plugging into an electrical outlet to store electricity, providing power to an efficient electric engine to move the wheels. There are two basic types of plug-in electric vehicles: Plug-in Hybrid Electric Vehicle (PHEV) and All-Battery Electric Vehicle (BEV), (more)

Electric car charging station
A device or station that provides power to charge the batteries of an electric vehicle. These chargers are classified according to output voltage and the rate at which they can charge a battery. (more)

Electric fireplace insert
A metal box placed inside an existing fireplace to help increase efficiency. Fireplace inserts may have glass doors which allow you to see the flames while the doors remain closed. Air enters through vents below, moving around the main chamber. The air heats up and exits through vents on the top of the unit. (more)

Electric heating
Electric baseboard heating converts nearly 100% of the electricity it uses into heat. However, according to the Department of Energy, using electricity as a fuel is often more expensive than heat produced using combustion appliances, such as natural gas, propane and oil furnaces. (more)

Electric motorcycles
Motorcycles that are battery powered. (more)

Electric smart meters
Smart meters are electric meters that use electronic data recording and two-way communication technology to provide you with more detailed information about energy usage and enhanced electrical services. (more)

Electric usage meter
Watt meters can help determine the amount of energy electronics and small appliances use. Many watt or usage meters can be found in your local home improvement store. (more)

Electric vehicle
A plug-in vehicle (PEV) has a battery which charges by plugging into an electrical outlet to store electricity, providing power to an efficient electric engine to move the wheels. There are two basic types of plug-in electric vehicles: Plug-in Hybrid Electric Vehicle (PHEV) and All-Battery Electric Vehicle (BEV), (more)

Electrically commutated motor
Electrically Commutated Motor, known as an ECM, is also called a brushless (BL) motor or brushless direct current (DC) motor. This type of DC electronic motor uses an electronic commutation system as it maintains a stationery magnet, or stator, in a constant polarity, while rotating magnet or rotor switches from north to south to south to north changing polarity to keep the rotor turning. It is powered by direct current and does not make use of brushes or any other type of mechanical commutator. (more)

Electroluminescent exit signs
These signs use ultra-energy efficient technology using 1 watt of electricity to save you energy on your emergency lighting. (more)

Energy audit
An energy audit is often the first step in making your home or business more energy efficient. An audit can help you assess how much energy you are using and evaluate what measures you can take to improve efficiency. But remember, audits alone don't save energy.

Energy auditor, BPI certified
Building Performance Institute, Inc. (BPI), certified energy auditors have gone through rigorous written and field exams based on nationally recognized standards. Exams are given in all 50 states and five foreign countries through independent test centers. BPI certifies individuals to verify they are highly trained and skilled in performing energy audits and ready to be part of the home performance contractor workforce. Certification is based on testing protocols set by the American National Standards Institute. (more)

Energy calculators
Energy calculators from the Department of Energy (DOE) allow customers to enter their own values, such as utility rates and hours of use, to help estimate energy and cost savings for energy-efficient products. Some of the links listed on the DOE website are web-based tools while others are Excel spreadsheets provided by ENERGY STAR® which can be downloaded for future viewing. Find a list of calculators on the DOE website.

Energy conservation
Reduction or elimination of unnecessary energy use. Examples of energy reduction or elimination include turning off the lights when you are not in a room and walking instead of driving. (home savings tips)

Energy efficiency
Using less energy while getting more service from your appliances and equipment. You can do this by practicing energy-efficient behaviors or using energy-efficient technology, such as new lights and appliances. (see ENERGY STAR)

ENERGY STAR
ENERGY STAR® is the trusted, government-backed symbol for energy efficiency helping to identify products to save energy, money, and protect the environment through energy-efficient products and practices. (more)

ENERGY STAR Most Efficient label
The U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) are now recognizing products as the most energy-efficient in their categories among those that have earned the Energy Star label. This "Most Efficient" pilot program continues Energy Star’s work to provide consumers with the best efficiency information so they can make investments that will lower their energy bills and environmental impact. It also aims to provide all manufacturers with an incentive for greater product energy efficiency while providing consumers new information about the products that comprise the top tier in respective categories. (more)

EnergyGuide label
If you’ve shopped for appliances, you’ve probably seen the bright yellow EnergyGuide label. Recently revised, it is now easier to find out how much energy an appliance uses. (more)

Evaluation
A study completed by a professional engineer, such as an energy auditor, that evaluates your use of energy. The auditor will evaluate your building or home and make recommendations to save energy. (more)

Exit lighting
Lighting hung to safely direct people out of a building in the event of an emergency or power failure. (more)


— F —

Fan
Fans, no matter whether they are sitting on a table, mounted on a pole or the wall, sitting on the floor, or mounted on the ceiling, create a wind chill effect that will make you feel more comfortable in your home or business. Whether they are used at night with the cool night air or during the day with your air conditioner, ceiling fans, according to the Department of Energy, are considered the most effective type of fan to lower air conditioning costs. (more)

Fan controls
An electronic system used in a business to operate a heating or air conditioning system to maintain a certain predetermined temperature or air flow setting. Upgrades to new controls may qualify for the Ameren Missouri Electric Business Incentive Program. (more)

Fan damper
A valve or plate that stops or regulates the flow of air inside a duct of a commercial or industrial boiler. (more)

Faucet aerator
A small and inexpensive device that easily fits on most modern indoor faucets. Aerator’s can help to reduce the water consumption in your home. (see Aerator)

Federal and State Incentives
For information on federal, state and local rebates and incentives toward the purchase of energy efficiency and renewable improvements and products. (more)

Fiberglass insulation
A type of insulation that provides good thermal insulation and can withstand high temperatures. The material is obtained by channeling molten glass through very fine tubes. When it hardens, it is flexible enough to be used as a fiber. (see Insulation)

Film, window
Window film is a thin layer or coating applied on the inside of any window or glass door to reflect the sun’s heat, keeping the room cooler and saving energy. (more)

Filter, furnace
A furnace filter is a removable barrier that fits somewhere in the furnace unit between the air intake and the motor fan. The filter protects the motor and internal components from airborne particles and dust that may damage the unit. (more)

Filter whistle
A clogged or dirty filter on your furnace or air conditioner can rob your system of efficiency and make your system work harder. Installing an air filter whistle may help. (more)

Fireplace damper / Flue sealer

A fireplace, wood- or pellet- burning stove usually has a damper located in the chimney or flue pipe just above the firebox. Made to withstand the heat of the fire, the damper is opened and closed to allow smoke to go out the chimney. If the damper is open without a fire burning, air inside your home could create a draft and may be going out the chimney, wasting energy. (more)

Fireplace glass doors
Fireplace doors help save energy all year long by keeping warm air from blowing down the chimney in the summer, and preventing heated air from escaping out of the chimney during the winter. (more)

Fireplace insert
An insert is a metal box placed inside an existing fireplace that helps increase efficiency. Fireplace inserts may have glass doors allowing the flames to be viewed while the doors remain closed. Air enters through vents below, moving around the main chamber. The air heats up and exits through vents on the top of the unit. (more)

Fixture
A fixed electrical device used in securing a light or lamp in a business or residential application. (more)

Flat-screen TV
ENERGY STAR® certified televisions use about 40% less energy than standard units. You can find the ENERGY STAR qualifying logo on everything from standard TVs, Plasma TVs, LCD, and HD-ready TVs. (more)

Flood lamp, CFL
A reflector CFL, or “R” series lamp, are used for recessed can lights, track lighting, dimming applications and in outdoor fixtures. CFL reflectors are available in a variety of sizes, finishes and wattages (more)

Flue sealer / Fireplace damper
A fireplace, wood- or pellet- burning stove usually has a damper located in the chimney or flue pipe just above the firebox. Made to withstand the heat of the fire, the damper is opened and closed to allow smoke to go out the chimney. If the damper is open without a fire burning, air inside your home could create a draft and may be going out the chimney, wasting energy. (more)

Foam insulation
A type of insulation that conforms to the shape of the space or cavity you a sealing. Sealing thoroughly, reduces drafts from the outside saving energy in both the heating and cooling seasons. (more)

Food service fryer
A commercial food service piece of equipment used in the preparation of fried food. ENERGY STAR® certified fryers use less natural gas reducing energy costs. (more)

Food service griddle
Griddles are a versatile piece of equipment and a workhorse appliance found on most kitchen lines. Variations in efficiency, production capacity, and temperature uniformity make it important to choose wisely when shopping for a griddle. Many energy-efficient griddles can deliver both high production capacity and excellent temperature uniformity. (more)

Food service oven
Convection ovens are the industry standard due to faster cook-times produced by increased hot air movement inside the oven cavity. In addition, convection ovens are now eligible for ENERGY STAR qualification. (more)

Food service steamer
Traditional steamer designs incorporate a separate boiler or steam generator to produce steam for the cooking compartment. A typical 6-pan “connectionless” steamer consumes a paltry 1 to 2 gal/h while operating at peak capacity. Replacing a boiler-style steamer with an equivalent sized connectionless steamer could save 174,500 gallons of water per year! (more)

Forms, concrete
Insulating concrete forms are forms for poured concrete walls, which remain as part of the wall once the concrete has cured. These walls provide a stable backing for drywall on the inside for siding or brick on the outside of a home. (more)

Freezer
A freezer can be upright or horizontal and is designed to maintain a temperature below freezing for longer storage of perishable food items. If you purchased your freezer before 1993, it may cost you an extra $35 annually on your utility bills compared to a new ENERGY STAR certified model. If you bought your freezer circa the 1980s, it's costing you an extra $70 each year. (more)

Freezer, smart defroster
Smart defroster kits can be added to walk-in refrigeration systems to help save energy and money. These defrosters decrease the amount of defrost cycles by 35-45% by defrosting the system only when necessary. (more)

Freezer recycling
Consider recycling appliances that are at the end of their life cycle or when it costs more to operate then than replace them It is recommended that older, large appliances (especially refrigerators and freezers) be taken out of service and recycled before there is an actual mechanical failure. (more)

Freezer thermometer
A refrigerator or freezer thermometer is a special thermometer used to measure the temperature inside your refrigerator or freezer. Settings too cold can waste energy.

Fridge
A device used to keep food cold. A refrigerator with an ENERGY STAR® label uses at least 20% less energy than required by current federal standards and 40% less energy than the conventional models sold before 2002.

Fryer
Energy efficient fryers that have earned the ENERGY STAR offer shorter cook times, faster temperature recovery times and qualify for the Natural Gas Rebate Program. (more)

Fuel cell
A device that generates electricity by a chemical reaction.

Furnace - residential
A furnace can provide heat to an interior space and has a fuel source of either natural gas, propane, electricity, wood, coal or fuel oil. (more).

Furnace filter
A furnace filter is a removable barrier that fits somewhere in the furnace unit between the air intake and the motor fan. The filter protects the motor and internal components from airborne particles and dust that may damage the unit. (more)

Furnace filter whistle
A clogged or dirty filter on your furnace or air conditioner can rob your system of efficiency and make your system work harder. Installing an air filter whistle may help. (more)
Learning Center - Terms D, E, F
 
 
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