Was concern about Ark Royal's hot hangars speculation?

Was the article's concern about excessive heat in Ark Royal's hangars just speculation?

It was mostly speculation at that stage. Later experience was hot and uncomfortable, but ventilation and lowered lifts helped keep conditions manageable.

The concern began as a prediction that the large steel hangar enclosure would become very hot. At the time of the professional debate, the carrier had yet to operate somewhere hot enough to test the ventilation fully. The later service account describes uncomfortable heat that did not become particularly dangerous to the crew. Lowering the lifts when operations permitted helped air circulation, and sailors often worked in shorts. A wooden deck covering offered insulation, but the Royal Navy regarded wood as a fire risk.