Distribution Center - Virginia

Changing Make-Up Air Units to Cambridge HTHV Space Heaters
Retrofit Case Study

Download Case Study PDF

Building Specifications 

  • 700,000 ft2
  • 17 year old building
  • Located in Shenandoah Valley, VA

Before - Make-Up Air 


  • Uneven temperatures
  • Poor system control
  • High operating costs
  • Deteriorating system

Operating Costs

Based on:
159,814 therms for 2007-08 heating season
Normalized to 30 yr avg. @ 59° avg. temp

$0.23/ft2 Total cost @ $1.00/therm

After - Cambridge Space Heaters


  • More even temperatures
  • Lower operating Cost
  • Better system control
  • Qualified for EPAct tax deduction

Operating Costs

Based on:
116,235 therms for 2010-11 heating season
Normalized to 30 yr avg. @ 61° avg. temp

$0.17/ft2 Total cost @ $1.00/therm


The Cambridge system used 27% less gas and provided a higher average temperature. The Cambridge system saved approximately $42,000/year in gas cost operating at $0.17/ft2  vs. $0.23/ft2. The savings would have been 35% if the same building temperature had been maintained.