Glossary of Terms

Btu, or British Thermal Unit, is a unit of energy measurement that can be used across fuel types. Approximate equivalent to energy required to heat 1 lb. of water 1 degree Fahrenheit. kBtu equals 1000 Btu; MMBtu equals one million Btu.

CO2e or carbon dioxide equivalent, is a standard unit of measurement that can be used across different greenhouse gas types. It allows all greenhouse gas emissions to be expressed as an amount of carbon dioxide which has an equivalent global warming impact.

Degree days are a simplified representation of outside air temperature, measuring how much (in degrees), and for how long (in days), outside air temperature was greater or less than a specified base temperature. The larger the number of degree days the more intense the weather (e.g. hotter in summer, colder in winter, and/or longer periods of heat and cold).

EUI, or Energy Use Intensity, is a unit of measurement describing a building's energy use and efficiency. A building with a smaller EUI is using less energy for each square foot of space, and is generally considered to be more efficient than a comparable facility with a higher EUI.

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Dept of Public Works

147 Hampshire St
Cambridge MA 02139


Hours of Service

Monday: 8:30am-8:00pm
Tuesday-Thursday: 8:30am-5:00pm
Friday: 8:30am-12 noon
24 Hour emergency 617.349.4860


Tuesday & Thursday: 4:00pm-7:30pm
Saturday: 9:00am-4:00pm

Owen O'Riordan