Note: New Addition has Cambridge heating units, old section has Cambridge heating units and one Air Rotation unit. 80% of building is now heating by Cambridge equipment. They replaced one Air Rotation unit.

Before - Indirect Fired Air Turnover Units

Building Specifications - Before addition & retrofit

• 105,948 ft²
• Located in Perrysburg, OH
• 1 @ 3125 MBH / 100,000 CFM  (2) 10 HP Motors
• 1 @ 2175 MBH / 60,000 CFM / 2-5 HP Motors

Operating Costs

$0.54/ft² Gas cost @ $1.00/therm
$0.12/ft² Electric cost @ $0.08/kWh

$0.66/ft² Total cost

After - Cambridge Space Heaters

Building Specifications - After addition & retrofit

• 210,000 ft²
• Located in Perrysburg, OH
• 1 @ 2175MBH / 60,000 CFM / (2) 5 HP Motors
• 3 @ 1200 MBH / 5700 CFM / 3 HP Motors

Operating Costs

$0.33/ft² Gas cost @ $1.00/therm
$0.03/ft² Electric cost @ $0.08/kWh

$0.36/ft² Total cost

Summary

After building size increased 100% and installed Cambridge, the fuel cost increased only 9%.