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HVAC Instruments from TSITSI supports the work of architects, builders, engineers, testing, adjusting & balancing (TAB) companies, contractors and installers, commissioning agents, and facility professionals. Whether you’re designing a new building, laboratory or cleanroom concept—or performing routine system maintenance, we help you meet and exceed expectations.

The HVACR industry turns to TSI for answers to performance questions. For over 50 years, our engineers have created new ways to measure and control ventilation systems and indoor air quality (IAQ). We put data into the hands of professionals. We help them meet goals for occupant comfort, energy efficiency, contamination control, risk management, and much more. 

Speed and accuracy for better testing and performance

HVACR professionals manage systems of every size and complexity—from residential properties to industrial and commercial systems to large-scale district networks. They are responsible for controlling specialized environments like hospital and operating rooms, laboratories and fume hoods, cleanrooms, biological safety cabinets, and isolators. Studies show that the work they do to optimize comfort, safety, and energy-efficiency has measurable benefits for human health and productivity.

At TSI, we understand that every HVACR system is critical to health, safety, quality, and compliance. With our tools and instruments, you have the accurate, real-time data you need to do your job and grow your business. 

Industry Applications


Indoor Air Quality

Managing temperature, humidity, outdoor air calculations, CO, CO2, and particles.


Ventilation Testing and Balancing

Properly adjusted systems can make a building more energy-efficient and cost-effective.


Hospital Monitoring and Control

Pressurized, isolated, and monitored hospital environments require special instruments.

Lab Controls

Laboratory Monitoring and Controls

With the right tools, laboratories can contain hazardous and infectious agents and manage costs.

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Patents & Awards

TSI researchers and engineers hold more than 50 patents.

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