Furniture Warehouse - Ohio

Changing Air Turnover Units to Cambridge HTHV Space Heaters
Retrofit Case Study

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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%.