The foyer where I live recently moved into a new, purpose-built, Minergie building, which we share with a block of sheltered apartments.
When we first moved in, it was freezing. At first the architect insisted it was because the underfloor heating needed a few weeks to 'get started', and because the other apartments were all empty.
Then he admitted there was a problem...
However, one interesting thing I learnt is that here (Vaud), bedrooms only have to be 18°c (the thinking being that you mainly sleep in your bedroom...)
We (the residents) argued that because our bedrooms are our only private spaces for relaxing / studying / writing / surfing the internet* (*delete as appropriate), the heating in our bedrooms should be turned up - because in effect they were a general living room as well as a bedroom.
It worked, and finally, after several months, the rooms are at a reasonable temperature.
On the flip side, I have an elderly friend who lives in an apartment block for refugees. She finds it very cold, but the engineer has come out and measured the temperature as 22-23°c, and so they refuse to adjust the heating, because it is an 'acceptable temperature'. She used to live in an apartment where she had more control over the heating, and she finds it very hard to understand that even though she is cold, the organisation that owns the building can do nothing because legally speaking, her apartment is not cold.
If your apartment is at this 'acceptable temperature' and you are still cold, may I offer my sympathies and suggest the purchase of a onsie? I sleep in mine, with pyjamas and a hot water bottle... but I am a chilly mortal.