Key

ROOF LEVEL
1 Built-up HVAC unit supplies the entire building with cool or warm air as necessary.
2 Fiberglass batt insulation (R-30) in ceiling.

THIRD FLOOR
3 Tankless gas-fired water heater eliminates standby losses.
4 Gas-fired hydronic boiler (75,000 Btu per hour) used for patio snowmelting. (The baseline building used 20,000 watts of electric resistance heating for this purpose.)
5 Hydronic snowmelt piping is embedded in patio slabs.
6 Daylit conference room uses dimmable fluorescent lights.
7 South office suite has high-efficiency parabolic downlights.
8 Master thermostat provides night setback temperature control.
9 Hurd InSol-8 double-film, gas-filled, low-e windows.
10 Rigid insulation (1”) on walls outside of framed construction.
11 Multifunction consolidation with printer/copier/ scanner/fax machine.
12 Dedicated data center cooling.
13 Recycled workstations (‘cubicles’) use fewer new materials.
14 Motion sensor light switches.

SECOND FLOOR
15 Skylight brings daylight into 2nd floor work space.
16 Low-flow fixtures for kitchen, bathrooms, and shower conserve water and energy.
17 Light well brings daylight into north offices.
18 Power monitor tracks usage for entire office space.
19 All 40-watt compact fluorescent sconces replaced with 3-watt LED sconces.
20 All incandescent lighting replaced.

GROUND FLOOR
21 Compact metal halide exterior downlights.
22 Compact fluorescent exterior sconces.
23 Extra insulation in plenum above garage.
24 Separate electrical meters for separate tenants.
25 Dedicated exhaust fans for beauty parlor and coffee shop.
26 Generator provides business continuity with backup power, reducing need for large UPSs.

Adapted with permission from original source: Houghton, David. “The E Source Columbine Building: Efficient Office Building Provides a Reality Check,” E Source Tech Update, November 1995.