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What We Do

Acutherm manufactures components for heating and air conditioning systems that make commercial buildings more comfortable, save energy, offer sustainability and can also reduce total installed costs. Our components are called Therma-FuserTM variable air volume (VAV) diffusers. They are used in VAV air conditioning systems which, instead of varying the temperature of the cooling air, vary the amount of the cooling air to maintain even room temperatures. How It Works

We make buildings more comfortable places to work.

Therma-FuserTM VAV diffusers are ceiling air diffusers with the thermostat and VAV damper built-in. These small zones of control provide individual comfort that precisely match the comfort requirements of the room or portion of the room served.

Therma-Fuser diffusers also provide a constant discharge velocity with comfort benefits of higher throws, no cool air dumping, better room air movement and uniform temperature distribution.

We save energy.

Therma-FuserTM VAV diffusers are energy efficient VAV diffusers that produce 15% to 47% energy savings.

The thermostat-actuator and damper inside each unit is designed to reduce the flow of supply air such that the volume entering the space is only the amount necessary to maintain a set temperature.  By preventing overcooling and overheating, overall energy usage is greatly reduced.

Therma-FuserTM VAV diffusers also have the lowest pressure drop of any VAV terminal, allowing for low-pressure systems and low energy fan motors.

No energy is required to operate the diffuser’s controls.

Energy Studies

26 LEED® credits can be influenced by specifying an Acutherm Therma-Fuser™ system.

Read more on energy studies. Achieving LEED with Therma-FuserTM Systems.


We reduce cost.

Different from a fixed-grill diffuser, a Therma-Fuser™ diffuser is a self-contained zone of control with the thermostat and VAV dampers built-in. 

Expensive above the ceiling labor and controls are significantly reduced.  On an installed cost basis the Therma-Fuser™ diffuser provides the lowest cost per zone of control. It is simply the most cost-effective way to manage a zone. 


We provide buildings with a sustainable HVAC solution.

The small zones created with Therma-Fuser diffusers make office layout changes easy. No zone is split when office walls are added or moved.

Customers using Therma-FuserTM VAV diffusers for as long as 30 years testify that no maintenance at all has been required. One of the reasons for this is the product’s simple construction that contains very few moving parts.