Direct-Fired Commercial Heating & Ventilation Technologies That Exceed Safety & Energy Standards

With Cambridge, Engineers Can:

  • Deliver Energy Efficiency Using HTHV Technology
  • Improve IAQ by Ventilating with 100% outside air
  • Specify Safe Equipment
  • Provide Indoor Air Quality
  • Meet ASHRAE 62.1 Requirements 
Discover Cambridge Engineering
HTHV Solutions For Building Owners - Cambridge Engineering


Not every commercial heating and ventilation solution is created equally. With High Discharge Temperature Heating and Ventilation (HTHV)  heating technology, one piece of equipment can dramatically reduce energy costs and improve Indoor Air Quality at the same time you are heating commercial and industrial buildings. Some think that you can’t improve the efficiency of commercial and industrial heating equipment - we know that Direct Fired HTHV heating technologies provide greater energy efficiency and IAQ than any other technology on the market today and into the future.

Additionally, ventilating a space with makeup air system utilizes fresh outside air to replace existing interior air that could be harmful to employees. Our Make Up Air System is designed with reliability and year-round energy savings in mind, along with low costs for installation and maintenance.


At CEI we have been committed to building products that are both safe and energy efficient.

Successful System Installations - Cambridge Engineering

Successful Cambridge system installations

Building Studies - Cambridge Engineering

Building Studies 
That Quantify Savings


Energy Efficient Space Heaters - Cambridge Engineering

Space Heated with Cambridge Equipment


20-70% Energy Savings Over Standard Unit Heaters - Cambridge Engineering

DOE study confirms HTHV savings



"The proven technology of Cambridge Engineering direct gas fired make up air and space heating units is a market changer that is being deployed nationwide. The HTHV technology is a proven technology that provides efficient and safe heating solutions better than any other combination of multiple products that are required to do what one Cambridge unit can do. A True Value Engineering alternative that facility owners will appreciate for many years."

Steven G. Liescheidt, PE, CCS, CCPR – Owner
SPPECSS Consulting, LLC - St. Louis, MO

"Each unit required special “Double Z” inlets to allow for the intake hoods to be positioned on a lower roof and drop down to the suspended units positioned at a 90° to the inlet in the higher bay monitor of the building. The Cambridge team assisted in multiple equipment layouts & final configuration that resulted in positioning all units in the “under-roof” configuration… Resulting [in a] sale."

Scott Campbell, President
Western Reserve Energy Corp. – Twinsburg, OH


HTHV Product Specifications For Engineers - Cambridge Engineering

Engineering Specs

Download complete engineering specifications for all Cambridge Engineering commercial and industrial heating products.

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CAD Drawings For Engineers - Cambridge Engineering


Download CAD installation, Revit files and dimensional drawings for Cambridge Engineering commercial and industrial heating products.

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High Efficiency Heaters By Cambridge Engineering - Cambridge Engineering


Learn more about direct fired makeup air, HTHV space heating, commercial gas heating and specialty heating applications.

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Learn More About Energy Efficient Heating

If you are ready to learn more about Cambridge Engineering’s energy efficient HTHV and Make up Air equipment give us an hour over lunch to present our solutions.