Cambridge Space Heaters

Operating Costs

Based on 5,682 Heating Degree Days @ 65°
$0.17/ft² Gas cost @ $1.00/therm
$0.02/ft² Electric cost @ $0.08/kWh

$0.19/ft² Total cost

Building Specifications

• R-14 Roof / R-10/R1.5 Walls
• 579,000 ft² x 38’ high
• 88 doors
• Located in Bethlehem, PA

Heating System

• (7) Cambridge Space Heaters
• Thru wall mounting
• 11,300 MBH total
• 63,500 CFM total
• 43.5 HP total - intermittent

Direct Fired Recirculation 

Operating Costs

Based on 5,750 Heating Degree Days @ 65°
$0.23/ft² Gas cost @ $1.00/therm
$0.16/ft² Electric cost @ $0.08/kWh

$0.39/ft² Total cost

Building Specifications

• R-19 Roof / R-19/R-2 Walls
• 361,200 ft2 x 40’ high
• 56 doors
• Located in Dayton, Ohio

Heating System

• (2) Direct-fired Recirculation Heaters
• Roof top mounting
• 8,250 MBH total
• 210,000 CFM total (.87 AT/Hr)
• 150 HP total  - continuous

Summary

The Cambridge system used 51% less total energy with more even temperatures. If the 361,200 ft² facility had installed a Cambridge system they could have saved approximately $72,000/year operating at $0.19/ft²  vs. $0.39/ft².