More than 180 organisations already rely on Freesi.

Our customers achieve measurable results

+35 %

Work productivity

Increase work productivity by more than 35% by improving indoor air.

-30 %

Maintenance costs

Decrease maintenance costs by up to 30% with proactive interventions.

+25 %

Investment returns

Achieve up to 25% higher investment returns on the property.

Our satisfied customers

Our customers’ other successes

These success stories are anonymous, but we can openly tell about the case by omitting our customer's name.

Access to Freesi for all key persons

The workers of an outsourced property management service sign in to FREESICLOUD to
view the conditions using the technical team’s credentials. One ventilation unit has switched
off, and during the same day, the indoor air partner called to inform us that there were
problems with pressure differences. The message directly reached the correct person
responsible for rectifying the problem.

Shortcomings in ventilation adjustments

A new build, still under warranty, was found to have severe shortcomings in its ventilation
adjustments, which have been located with the help of Freesi. The customer has carried out
the recommended measures that we have suggested, and by just adjusting one unit, all the
points have been balanced. Customer’s comment: “There should be a monitoring system
like this one at every site”.

Ventilation unit’s motion sensor fault

The control of the ventilation unit operated with a motion sensor which was broken. This
resulted in the air not being sufficiently replaced on the premises. With the help of the
observation made by the control room, the property's maintenance was informed within 24
hours that the carbon dioxide levels in the area of this specific ventilation unit had increased
above normal.

Detecting insufficient building technology

In a classroom, it was observed that the existing building technology could not implement
sufficient indoor air conditions. A separate ventilation unit was installed in the classroom; the
carbon dioxide levels decreased drastically after this. Freesi also allowed users to be
informed about the before and after situation, which, in turn, improved user satisfaction.

Ensuring sufficient ventilation

According to an authority decision, the ventilation at the site must be on all the time. Our
customer’s technical maintenance thought this was the case. However, the TVOC values
indicated that the concentration levels increased during weekdays between 6 pm – 6 am,
which signifies that ventilation was working according to the time programme. A request was
made for the site’s ventilation units’ operation to be inspected.

Combining experienced and measured indoor air

With the help of Freesi, the customer has been able to share reliable data about indoor air
quality with users who have submitted complaints concerning indoor air. As a result, there
have been no further user complaints as they have been able to confirm that their work
premises are actively monitored to ensure healthy conditions.

Detection of a stopped ventilation unit

During use, the carbon dioxide levels of a classroom had occasionally increased beyond the
threshold value. Therefore, it could be stated that the ventilation of the premises did not
operate correctly. The room-specific ventilation unit was inspected, and it was noticed that
the extension cable, which supplied the ventilation unit, was broken. The broken extension
cable was replaced with a new one, and the ventilation worked correctly once again.

Measurement points’ sudden differential pressure change

Freesi was used to detect a significant differential pressure change between two
measurement points where air supply had been restricted to a specific part of the building
due to the frozen solid outdoor air grid. Therefore, Freesi allowed the customer to respond
quickly, and the property's air supply was rectified.

Optimising premises for their intended purpose

Our customer had over-pressured premises, which is under control. The space forms an
archive room where material is permanently stored. The air humidity had been more than
60%, which must not increase there. As a solution, the property manager orders dryers and
the installation of a ventilation-improving fan. The customer no longer requires manual

Air leak from the base floor

Premises under negative pressure were observed in a school building, and these premises
were at risk of drawing in leaks of microbe-contaminated air from the base floor. In addition
to sealing work, it was recommended that the ventilation unit's supply and exhaust air flows
were adjusted, and the base floor was underpressurised to control the risks.

Detecting incompatible building systems

The control room detected increased overpressure at the property, which was reported to
the customer. The customer had previously repaired fans and automation at the property,
but this indicated that the automation did not work with the new and old fan technology. As a
result, the automation shall be replaced during the upcoming summer.

Benefits of long-term measurements

Negative pressure premises were observed in a school building outside the in-use hours. A
local technician visited the site to carry out momentary measurements. According to this
report, the differential pressure sensor at the site may have been situated in a location where
a lot of wind-caused swaying occurred. However, it could be verified, with the help of Freesi,
that the site had been under equally negative pressure for several months since there was
measurement data for several thousands of hours. The air supply levels of the ventilation
units were adjusted at the site. After this, the pressure differences were between (0Pa..-8Pa)
without affecting the pressure differences of the other premises.

Readjustment of temperature

According to Freesi, the premises had constantly been too warm for several months. The
janitor visited the premises to check the functionality of the thermostat. According to him, the
thermostat indicates that the temperature is 21°C; in reality, the temperature in the premises
is constantly over 23°C. Based on this information, the property owner orders the
replacement of the thermostat so that the temperatures can be decreased in a controlled
manner and are uniform with the indoor air temperature, and IISY’s technical department
can monitor the change in temperatures.

Energy savings in ventilation

A savings potential, which does not weaken conditions, was observed in the run times of the
ventilation unit. A new time programme was recommended, reducing ventilation energy and
consumption costs by 18% without decreasing indoor air quality.

Assigning responsibility to the maintenance staff

Our customer suspected a third-party operator hired to carry out the property's maintenance
and service work was not doing their duties as agreed. With the help of our service, their
suspicions were confirmed. Overheating by just one per cent in the relevant property stock
incurs 40,000 euros worth of additional costs.

  • Savings of more than 100,000€ / year