What is HTHV?

High Temperature Heating & Ventilation (HTHV) is a new technology class of products created by the Department of Energy with the goal of increasing the energy efficiency of heating equipment throughout the US. 

By definition HTHV technologies are certified to a discharge temperature which is greater than or equal to 150°F and a temperature rise greater than or equal to 140°F and has the ability to both heat and ventilate commercial and industrial structures. 

These energy saving heaters provide more than just heating. They also have the ability to provide HeatingVentilation, and Destratification all from the same piece of equipment. 

HTHV products are the Safest, most Energy Efficient way to heat and Cambridge’s HTHV products also have the Lowest Total Cost of Ownership when compared to other heating technologies, especially when compared to standard efficiency unit heaters.

Our HTHV products have been proven through both the DOE study and our own building studies to save between 20% to 70% on energy depending on the building, location, application, and installation. This shows that HTHV heaters are the most energy efficient space heater on the market.


At Cambridge Engineering we know that safety is not only important it’s required. Our commitment to safety and innovation are the guiding principles for everything that we manufacture and it is because of this commitment that we strive to manufacture the safest HTHV direct fired energy saving heaters available. Our HTHV heaters are “Inherently Safer” because our products use 100% outside air to heat the space. What does 100% outside air provide... VENTILATION and proper ventilation means superior Indoor Air Quality. At Cambridge we have a saying, ”Buildings Don’t Need to Breathe But People Do”™. 

HTHV heating is the safest way to heat your facility or warehouse

To learn more about the inherent safety
of HTHV technology download our eBook
"Why direct fired HTHV is the safest way to
heat and ventilate your facility".

Energy Efficiency

Save up to 70% on combined gas and electric energy costs by installing Cambridge HTHV energy efficient heaters.

Cambridge HTHV direct gas-fired space heaters with Blow-Thru® technology are used to heat and ventilate commercial and industrial buildings where non-ducted heating solutions are specified. Our HTHV technology is recognized as the best and most energy efficient way to heat and ventilate commercial and industrial buildings in both new and retrofit installations. 

The Department of Energy and energy modeling studies document that HTHV heating technology systems like our line of energy saving heaters use the least amount of energy to heat/ventilate warehouses and other commercial/industrial buildings with large open spaces.

Direct fired HTHV heaters are more energy efficient than other heaters

To learn more about the efficiency HTHV products 
download our eBook “Why direct fired HTHV is more
efficient than unit heaters”.

Lowest Total Cost

Whether it is a mechanical contractor looking for the lowest first cost or a building owner looking for the lowest total cost Cambridge Engineering’s HTHV products will meet your needs. The HTHV technology in our energy efficient heaters offers the lowest overall first cost because one piece of equipment will heat, ventilate, and destratify. With other heating technologies you have to include ventilation and destratifation equipment to accomplish the same indoor air quality goals as on Cambridge HTHV direct fired heater. And because HTHV is very energy efficient your long term operating cost and facility impact cost are drastically reduced as well.

It is important to determine the lowest total heating costs for each project. Don’t let what appears to be the lowest equipment cost determine what is important when it comes to reducing installation, operating, and facility impact costs. 

Cambridge manufacturers the most energy efficient space heater on the market by utilizing HTHV technology. Our energy saving heaters are built to save costs as well for both contractors and business owners.

HTHV heaters have the lowest total costs

To learn more about why HTHV heaters have the lowest
total cost download our eBook "Why 100% outside air
HTHV heaters have the lowest total installed cost".

DOE Study



Low Initial Cost For Contractors


• HTHV is 3 products in 1 unit
• Lower equipment cost per usable Btu


• Perfect for retrofit applications
• Lightweight design with small footprint
• Prepiped, prewired & pretested
• Fewer heaters means less piping & wiring
• Designed for faster installation & start-up

Low Operating Cost for Business Owners

Energy Efficiency

• 20% to 70% documented energy savings
• High Btu/CFM ratio reduces heat load


• Hinged doors for easy equipment access
• Unmatched 5 year burner warranty

Lowest Facility Impact Cost

• Use of 100% fresh air improves IAQ
• Addresses negative air building problems