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Title 24 Energy Compliance Reports

Glossary of Energy Terms
full Energy Terms Glossary

Extension of or increase in conditioned floor area and volume of a building, which can be new construction or adding space conditioning to an existing space

Any change to a building's water-heating system, space-conditioning system, lighting system, or envelope that is not an addition

American Society of Heating, Refrigerating, and Air-conditioning Engineers

Conditioned Floor Area (CFA)
Floor area (in square feet) of enclosed conditioned space on all floors of a building, as measured at the floor level of the exterior surfaces of exterior walls enclosing the conditioned space

Conditioned Space
Space in a building that is either directly conditioned or indirectly conditioned

Conditioned Space, Directly
An enclosed space that is provided with wood heating, is provided with mechanical heating that has a capacity exceeding 10 Btu/hr-ft²), or is provided with mechanical cooling that has a capacity exceeding 5 Btu/hr-ft², unless the space-conditioning system is designed for a process space

Conditioned Space, Indirectly
An enclosed space, including, but not limited to, unconditioned volume in atria, that (1) is not directly conditioned space; and (2) either (a) has a thermal transmittance area product (UA) to directly conditioned space exceeding that to the outdoors or to unconditioned space and does not have fixed vents or openings to the outdoors or to unconditioned space, or (b) is a space through which air from directly conditioned spaces is transferred at a rate exceeding three air changes per hour

Daylight Area
Floor area under skylights or next to windows. The daylight area includes Primary Side-lit Daylight Area, Secondary Side-lit Daylight Area, and Sky-lit Daylight Area

In simplest terms, windows or glass doors. Technically fenestration is described as any transparent or translucent material plus any sash, frame, mullion or divider. This includes windows, sliding glass doors, French doors, skylights, curtain walls and garden windows

A covering of transparent or translucent material (typically glass or plastic) used for admitting light

Heating, Ventilating and Air Conditioning (HVAC)
A system that provides heating, ventilation and/or cooling within or associated with a building

Low-Rise Residential Building
All low-rise residential occupancies including single family homes, duplexes, garden apartments and other housing types with three or fewer habitable stories:
• All single family dwellings of any number of stories (Group R-3)
• All duplex (two-dwelling) buildings of any number of stories (Group R-3)
• All multifamily buildings with three or fewer habitable stories (Groups R-1 and R-2)
• Additions and alterations to all of the above buildings

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