15 May 2003
3-2.5.2 Small Remote Facilities. Electric resistance heating may be used where all of
the following criteria are met:
The individual facility (total building) heating load is less than 15,000 Btu per hour (4
kW) provided natural gas is not available within a reasonable distance;
The facility has a maximum total energy consumption of less than 60,000 Btu per
square foot (190 kilowatt-hrs per square meter) per year (nominal 40-hour week use)
or less than 118,000 Btu per square foot (1,340,00 kJ per square meter) per year
The facility is equipped with thermostats with a maximum setting of 75 degrees F (24
degrees C) and a positive cutoff above 65 degrees F (18 degrees C) outdoor
All facilities occupied less than 168 hours per week must be equipped with a
temperature setback to a maximum of 50 degrees F (10 degrees C) during all
unoccupied periods. Small offices or duty stations located within larger unheated or
partially heated buildings (e.g., warehouse office, dispatch office in a motor pool,
duty room in an armory or reserve facility) requiring less than 15,000 Btu per hour
(4kW) may use electric resistance heating under the conditions outlined above.
COOLING SYSTEMS. When used as the only means of cooling, fan-coil units
can rarely provide adequate dehumidification for the ventilation loads and their use in
this manner is not recommended.
Chilled Water. Determine the optimum supply and return water temperature
differential by life cycle cost analysis.
Cooled Air. To the extent practical, minimize system airflow. Use integrated
air conditioning and lighting systems whenever the general lighting level is 100 foot-
candles (1000 lux) or greater.
Comfort Ventilation. Gravity ventilation is rarely adequate as a reliable
source for comfort ventilation. It can be used in high-bay areas that are rarely occupied,
such as storage buildings, or in areas that are difficult to ventilate, such as hangars.
Consider nighttime air flushing of spaces, multi-speed fans, increased insulation,
improved shading, and building site to improve the effectiveness of comfort ventilation.
If a waiver to provide air conditioning in an area not authorized is submitted in
accordance with paragraph 1-4, an hour-by-hour simulation of indoor conditions using
comfort ventilation only will be included in the waiver request.
Evaporative Cooling. Use evaporative cooling where the facility in
question is eligible for air conditioning, and evaporative cooling can provide the required
indoor design conditions based on the appropriate outdoor design conditions. In many
locations where evaporative cooling cannot provide the required indoor conditions year-