Where to mount your CO2 IAQ Monitor

HVAC Testing and IAQ CO2 Monitoring in Homes

The quality of the air we breathe is more important than you may think. Rooms with poor ventilation can often see a buildup of carbon dioxide (CO2), which can lead to severe negative health effects.

For example, one case study has shown that the accumulation of CO2 can lead to negative health effects for students in pertaining to classroom application. The study states, “Recent research suggests that a school’s physical environment can also play a major role in occupant and student academia performance. Poor Indoor Air Quality (IAQ) can increase absence due to respiratory infection, allergic diseases, biological contaminants, or adverse reactions to chemicals used in schools.” However, on the contrary it has been shown that by monitoring overall indoor carbon dioxide levels, you can actually increase your focus and productivity.

Not only are there positive effects on personal health with CO2 monitoring, but there are also clear benefits in energy consumption as well. A key study from the Ashrae Journal says “Buildings that have properly installed carbon dioxide-based demand-controlled ventilation (DCV) systems, can reduce over-ventilation, saving money on energy costs.” The demand for environmentally friendly and HVAC ventilated CO2 monitors is even on the rise, as consumers are taking a stand to reduce unnecessary over-ventilation and looking at more cost effective solutions.

Where Should I Mount my CO2 Monitor?

Your CO2 monitor mounting height is fully dependent upon the reason why you are monitoring your overall indoor air quality (IAQ). Typically you would be monitoring carbon dioxide (CO2) levels for one of two reasons:

Indoor Air Quality

In most homes, offices or classroom environments, desktop CO2 monitors like the TIM10 Desktop CO2, Temp and %RH monitor should be utilized to monitor carbon dioxide levels as they would be experienced by occupants indoors. This means the monitor should be set on a desk or flat surface.

wall mounted co2 monitor

When discussing wall-mounted CO2 monitors or IAQ devices, these should be mounted at the same height as a thermostat - about 48 inches from the floor. Like your thermostat, the CO2 sensor should not be mounted or set near outside doors or windows as this can make the space appear to have more fresh air than it actually does.

Another key factor when choosing a location for your CO2 monitor is that people breathing on the device will negatively affect the reading. You will want to take that into consideration or mount the device in a location where visitors will not congregate.

For example, a wall-mounted IAQ monitor is the Tsense touch screen CO2 + %RH transmitter. This device is designed to measure 0-2,000 ppm CO2 and is available with or without an LCD touch screen display.  

An alternative to a wall-mounted CO2 monitor is a duct-mounted CO2 sensor. These devices are best used where a single space or multiple spaces with common occupancy patterns are being ventilated. They sample the air from within the return air ducts, ensuring the most consistent average air quality for each zone of the building.


Many industries utilize compressed carbon dioxide. These industries include brewing, restaurants, and cultivation facilities to name a few. Wherever there is compressed CO2 being stored or produced, a CO2 safety alarm is required. These safety devices have stricter CO2 monitor installation guidelines and are  often required by state and local fire marshals. View the Remote CO2 Storage Safety 3 Alarm, for reference.

Which CO2 Monitor is Right for You?

First, you must consider your application. Are you monitoring carbon dioxide levels for health and indoor air quality, or for safety purposes? If the answer is indoor air quality, the next question is wall-mounted or desktop?

One of the most common phone conversations we receive from customers is the surprise they get in overall benefits from their new CO2 meter in homes or offices. They've found that high CO2 levels indoors can have a direct impact on their quality of life, overall productivity and attention span.

If you have questions in regard to which Indoor Air Quality monitor is ideal for your application and environment needs, speak to an expert today

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