Warehouse Heating

Cambridge Space Heaters vs. Unit Heaters 
Comparative Case Study

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Cambridge Space Heaters 

Operating Costs

Based on 3,369 Heating Degree Days @ 55°
$0.15/ft2 Gas cost @ $1.00/therm
$0.02/ft2 Electric cost @ $0.08/kWh

$0.17/ft2 Total cost

Building Specifications

  • 46,000 ft2 x 28’ high
  • R-12 Roof / R-11 Walls
  • Thermostats @ 55°
  • Building unoccupied

Heating System

  • (2) Cambridge Space Heaters
  • 1800 MBH total
  • 7,000 CFM total
  • 4 HP total – intermittent

Unit Heaters 

Operating Costs

Based on 3,369 Heating Degree Days @ 55°
$0.30/ft2 Gas cost @ $1.00/therm
$0.02/ft2 Electric cost @ $0.08/kWh

$0.32/ft2 Total cost

Building Specifications

  • 42,000 ft2 x 28’ high
  • R-12 Roof / R-11 Walls
  • Thermostats @ 55°
  • Building unoccupied

Heating System

  • (12) Unit Heaters
  • 3000 MBH total
  • No outside air
  • 4 HP total - intermittent

Summary

The Cambridge system used 47% less total energy. If the 42,000 ft2 facility had installed a Cambridge system they could have saved approximately $6,000/year operating at $0.17/ft2  vs. $0.32ft2.