HVAC measurements
for better indoor environments
Reliability is a priority in building automation systems, and Vaisala’s HVAC sensors and transmitters are built to perform.
Download Vaisala HVAC ebookPremium sensors and transmitters for professional use
You will find humidity, temperature, carbon dioxide, and differential pressure transmitters in our selection of high-class measurement instruments. The transmitters are especially beneficial in cooling and air-conditioning of critical infrastructures, demand-controlled ventilation systems, indoor air quality monitoring, and ventilation controls of sites with high-reliability requirements.
Why choose Vaisala HVAC measurements?
- Unrivaled performance. Transmitters from Vaisala are renowned for their unrivaled performance, reliable results, and low total cost of ownership.
- 5-year warranty. We are confident in our products' lasting quality and long lifetime and offer a standard warranty period of five years on our HVAC transmitters.
- A sustainable choice. The long-lasting performance, support for field calibration, easy maintenance, exchangeable measurement components, and precise measurements enable better control of HVAC processes.

Vaisala's reliable and accurate HVAC meters and sensors are designed with energy efficiency in mind, whether you are optimizing cooling towers or demand-controlled ventilation. Our large selection includes ±3% and ±2% humidity and temperature measurement HVAC meters, CO2 measurement sensors and also handheld meters. They can be used indoors and outdoors, and installed on walls or in ventilation ducts. To see where our HVAC sensors can be used, enter the Vaisala HVAC House or view all our HVAC sensors at a glance.

Why Infosys chose Vaisala?
Infosys, the second largest Indian IT-consulting company with 200,000 plus employees and revenue of over USD 10 billion, chose Vaisala’s HVAC sensors for its projects.
“We find that Vaisala is unique with the 5-year stability specification for the HVAC products. In the last 3 years we have been using the products, we have received timely support from Vaisala and are quite satisfied with the product quality”, says Mr. Vikas Makkar, Regional Manager Infrastructure Team at Infosys.
Photo: Courtesy of Infosys.

Download Vaisala HVAC eBook
Download the brand new Vaisala HVAC eBook and explore our HVAC instruments and services offering.
- Learn how to choose the right parameters and sensors for HVAC control.
- Get tips on how to install HVAC sensors.
- Read what our customer say about our HVAC sensors
- Find out about our calibration services
- Watch free webinars
- Explore the FAQ’s section.

Easy Installation of HVAC Sensors
You have several HVAC meter options to choose from to best suit your needs. We have a wide selection of wall-mounted and duct-mounted HVAC meters for indoor and outdoor use. Which ever meter, sensor or transmitter you choose, they are all easy to install and require very little maintenance. Watch video on how to install the Humidity and Temperature Transmitter Series HMW90 sensor and see how fast and easy it is.
CARBOCAP® Technology inside
Vaisala uses a single-beam and dual-wavelength NDIR (Non-dispersive infrared) technology for measuring CO2, The patented CARBOCAP® technology is used in all our CO2 sensors. This technology incorporates a unique tunable band pass filter that was developed by Vaisala and is manufactured in our own state-of-the-art cleanroom. View this video to find out why it's unique and why it makes the Vaisala CO2 measurement the most reliable and accurate one on the market or learn more on our carbon dioxide page.
PRODUCTS
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Humidity and Temperature Transmitter Series HMW90
Typical applications are include museums and archives, production and warehouse facilities, data centers, laboratories, and testing environments.

CO2, Temperature and Humidity Transmitter Series GMW90
The wall-mounted Vaisala GMW90 Series CARBOCAP® Carbon Dioxide, Temperature and Humidity Transmitters are especially suited for green building projects and demand controlled ventilation.

Humidity and Temperature Transmitter Series HMDW80
The HMDW80 series is versatile with transmitters for wall and duct mounting for measuring relative humidity and temperature in various building automation applications.

CO2, Humidity and Temperature Transmitter Series GMW80
Measuring CO2 is the most economical way to monitor both indoor air quality (IAQ) and human presence with one sensor.

Duct Humidity and Temperature Transmitter HMD110
The duct-mounted high-accuracy transmitter HMD110 is designed to measure humidity and temperature in HVAC systems.

Duct Temperature Transmitter TMD110
The duct-mounted high-accuracy transmitter TMD110 is designed to measure temperature in HVAC systems.

Duct CO2 Transmitter GMD110
The duct-mounted high-accuracy transmitter GMD110 is designed to measure carbon dioxide in demanding HVAC applications.

Immersion Temperature Transmitter TMI110
The high-accuracy immersion temperature transmitter TMI110 is designed for measuring cooling/heating water temperatures in HVAC automation systems.

Humidity and Temperature Transmitter HMW110
The wall-mounted high-accuracy transmitter HMW110 is designed to measure humidity and temperature in HVAC applications.

Temperature Transmitter TMW110
The wall-mounted high-accuracy transmitter TMW110 is designed to measure temperature in demanding HVAC applications.

Outdoor Humidity and Temperature Transmitter Series HMS110
HMS110 ±2% transmitters directly output wet-bulb temperature, enthalpy and dew-point in addition to RH and temperature.

Differential Pressure Transmitter PDT101
The PDT101 differential pressure transmitter is designed for demanding applications. There are dedicated models for critical and regulated environments with very low differential pressures, and unidirectional models for air handling systems.
Watch HVAC related webinars
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Paradigm shift in building ventilation: Future requirements for Demand Controlled Ventilation and Indoor Air Quality
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