Cambridge Space Heaters
Operating Costs
Based on 4,913 Heating Degree Days @ 60°
$0.11/ft2 Gas cost @ $1.00/therm
$0.01/ft2 Electric cost @ $0.08/Kwh
$0.12/ft2 Total cost
Building Specifications
- 999,700 ft2 x 35’ high
- R-14 Roof / R-10 Wall
Heating System
- (8) Cambridge Space Heaters
- 16,192 MBH total
- 81,920 CFM
- 60 HP total - intermittent
Direct Fired Recirculation 
Operating Costs
Based on 4,913 Heating Degree Days @ 60°
$0.37/ft2 Gas cost @ $1.00/therm
$0.05/ft2 Electric cost @ $0.08/Kwh
$0.42/ft2 Total cost
Building Specifications
- 814,848 ft2 x 37’ high
- R-14 Roof / R-10 Walls
Heating System
- (4) Direct Fired Recirculation
- 23,548 MBH total
- 215,000 CFM
- 120 HP total – continuous
Summary
The Cambridge system used over 71% less total energy with less temperature variation. If the 814,848 ft2 facility had installed a Cambridge system they could have saved approximately $244,000/year operating at $0.12/ft2 vs. $0.42/ft2.