Screed drying - Incorrect drying program set

I have read that heating the screed up to about 50°C for cover maturity heating also has the positive side effect that the next heating period will mean lower energy costs. Is there any truth to that?

Heating up is purely functional heating and has nothing to do with cover maturity!!!

@ Oetzi: Many thanks first of all "for the flowers"!
Regarding your questions:
"Heated screed, and the heating program only starts (...) after almost 5 weeks."
Answer:
Basically, every screed dries out to the readiness for covering after about 6 weeks even without additional heating (here: warm water underfloor heating); provided that appropriate ventilation is ensured.
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"The screed is therefore already somewhat dry on the surface, but presumably still quite moist underneath."
Answer:
"Somewhat dry" is certainly an understatement.
Presumably, but the CM residual moisture measurement will reveal this, the screed would also be dry without heating.
But!
Functional heating to check the components (the heating elements) is indispensable.
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"Now I want to accelerate the drying (...) a bit and use condensation dryers. Is that safely possible during the functional heating or should the construction dryers be switched on only afterward?"
Answer:
That is possible, but not always sensible. The use of condensation dryers is worth considering in terms of economic efficiency!!! Please do not underestimate the energy costs that "threaten" in the background.
Good ventilation with corresponding humidity in the outside air is usually sufficient, as long as the outside air does not have humidity over 70%.
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"And which humidity level should the construction dryers not go below so that edge curling does not occur?"
Answer:
Edge curling of screed edges can also occur during slow drying – and is not a defect but a material-specific property of mineral screeds.
However, a construction dryer should not cause relative humidity < 35%, otherwise the capillaries break off: the screed cannot dry out further!
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"Additionally, I would just set up normal fans ..."
Answer:
That is the best solution!! Better several fans with open windows than forced drying.
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"Alright, or absolutely take the special fans from the construction dryer rental?"
Answer:
Sufficiently sized fans capable of generating noticeable air movement are completely sufficient!
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"For how long should one use the construction dryers to get the place reasonably dry?"
Answer:
No concrete statement is possible here because a construction dryer draws moisture not only from the screed but also from the masonry.
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Regards: KlaRa

Dear Thank you very much for the detailed response! Due to the partly quite humid weather of the past few weeks, it is probably not completely dry yet. Our solid house was built at a crazy speed, the earthworks started in March and now at the beginning of July the screed has already been in for more than a month. The construction didn’t really have much time to dry in the masonry etc., so I want to be a bit careful. I don’t want mold or other problems in the long run. I already take from this that at such a late stage I don’t have to worry much about distortion from drafts anymore. That’s positive at least. Some corners have already risen a bit (the spirit level shows a slight tilt each time), but hopefully that will settle down again on its own by the end of the drying out period.

Also here: definitely dryer and not heater! It is very unfortunate that so many issues are mixed up here.

was a mobiheat yellow device with us, connected via heavy current. On the supply/return line of the underfloor heating.

With us it was a device called mobiheat yellow, connected via three-phase power. On the supply/return of the underfloor heating.

Well, the thing heats the underfloor heating electrically because the heat pump is not running yet or something. Heating does not necessarily mean drying. But sure, warm also dries better.

Heat pump not installed yet. Just ventilate the warm, humid air out. Would a dryer have been more effective?