Frequently Asked Questions

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1. Is your system guaranteed to heat my whole house?

It all depends on your home’s thermal performance and your heating requirements. MyDATEC thermodynamic CMV can provide on average up to 3KW of heat from its exhaust air heat pump.

For new dwellings: Generally, MyDATEC guarantees nearly all the heating needs for new dwellings built in accordance with 2012 Thermal Regulations norms. Adding a wood stove, an underground heat exchanger, and/or other measures that protect the home against extremely cold weather, can be advised in certain circumstances.

For renovation work: MyDATEC guarantees most of the heating needs during mid-season, which will allow you, for instance to stop your old energy-consuming system during that time of the year. In certain cases, MyDATEC and your other heating system can be combined to work together in order to optimize savings.

The best solution: Depending on your home’s heating thermal performances, its size and where you are located, specialized thermal engineering services will be able to assess your heating requirements. Following this assessment, we will be able to advise as to whether your MyDATEC unit needs an extra heater.

2. Is MyDATEC CMV compatible with LEB, certified passive houses and with positive energy houses?

Absolutely, it is actually specifically designed for them. You should also be aware that the new RT 2012 legislation requires the use of thermal engineering services. Providing us with their contact details means we can pass on the information required for the thermal study.

3. Why choose MyDATEC CMV over a dual flow CMV? How can we get better results than a static heat exchanger with a 100% return?

When ventilating, cold air is let in (at the current outside temperature), and once it is heated to the ambient temperature (around 20°C), it is then expelled out of the building. This loss represents a significant part of the total heating consumption. The solutions are the following:

  • The dual flow CMV with static exchanger will reduce the waste by capturing some of the heat before the exhaust air is rejected.
  • Instead of wasting this energy, which is approximately 20°C in temperature, the thermodynamic CMV will use it as a source to produce heat or coolness (heat pump theory).
  • To compare both systems, we could sum it up by saying that the thermodynamic CMV has a return of 400 to 500% as it creates 4 to 5 times more energy than it uses.

4. What is the difference between a dual flow thermodynamic CMV and a traditional air/air heat pump?

  • Thermodynamic CMV is a ventilating system combined with a air/air heat pump system traditionally found on the market
  • Main difference: Air/air heat pumps draw their heat from the outside air (between -10°C and +10°C in winter). A heat pump utilizing exhaust air (MyDATEC) draws its heat from the building’s exhaust air via the ventilation system (constantly at 20°C)
  • The drawback of the air/air heat pump is that it does not work as efficiently in winter (when the source air is cold) and the need for warm air is greater
  • The performance of Thermodynamic CMV increases in winter (COP of 6 at -10°C)

5. How does the thermodynamic exchanger work?

  • MyDATEC thermodynamic recuperator, thanks to its refrigerated circuit, (exhaust air – fresh air heat pump) can cool exhaust air down to approximately +2°C. To the “18°C” therefore extracted, will be added the dehumidification of exhaust air from the kitchen and bathroom, the “latent” heat, as well as the heat coming from the power supplied by the machine (compressor, ventilators)
  • In fact, the fresh air temperature will be high – between 25 and 30°C, including 18 to 20% recovered from exhaust air. (In the example above, the evolution will be: exhaust air: +20°C => +2°C ; fresh air: +10°C => + 35C°).
  • When the exhaust air is rejected from the building at a lower inferior temperature than the external temperature, which will be the default occurrence (example +2°C for +10°C outside temperature), the system will gather heat from outside

6. Why has it taken so long to focus on indoor air pollution, VOC, formaldehyde?

Up until the 1950’s, for example, they were no carpets or sophisticated cleaning products and pollution sources were less of a concern. These houses were also real “sieves”, so, by default, they were well ventilated. In the 70’s, with the emergence of the oil crisis, insulating houses became a priority in order to make energy savings. It was this phenomenon that caused indoor pollution, by trapping air in our houses, at a period when mechanical ventilation was not developed. Health issues, in particular allergies, have been on the increase ever since.

7. What happens if I open my windows?

It’s the same concept as taking the top off your thermal flask: that’s what it is there for, but one should not over use it, otherwise the coffee could get cold! Also when you open your windows, the homes airflows are disrupted, and your ventilation is not as efficient. When equipped with MyDATEC, you should only open your windows infrequently so as to not loose heat.

8. Why choose MyDATEC over any other thermodynamic CMV brand ?

  • MyDATEC is a Lyon based brand, exclusively made in France
  • MyDATEC has the easiest setting up system and offers the most compact unit on the market
  • MyDATEC has the best exhaust air heat pump performances
  • MyDATEC is the only brand to offer such high levels of service (technical assessment during the quotation phase, kit preparation, installation hotline, free breakdown diagnostic analysis)

9. Is MyDATEC compatible with a house on different levels ?

MyDATEC system can very easily be set up in a house on different levels, but similarly to a ground level house, the installation will depend on your house layout. It is advisable to plan specific spaces for duct passages, such as false ceilings, in the initial planning stages with your architect.

10. Is it possible to transform a single flow into a dual flow or a dual flow thermodynamic CMV ?

Nothing is impossible. However, there are many factors to take into account when wanting to change your CMV into a dual flow thermodynamic CMV. Firstly, you have to plan a second duct network, required for introducing new air. Secondly, you must also plan setting up the dual flow exchanger, preferably inside the room being heated.

11. How should MyDATEC dual flow thermodynamic be maintained?

Like anything, it has to be maintained! Don’t forget that a CMV collects most of the dust from the house, which is full of humidity and static electricity that finds its way on the filters, which will have to be replaced once to twice a year.


If you have a question that is not answered / addressed in the FAQ, please do not hesitate to contact us by email or phone. We will get back to you as soon as possible