AonP has the right idea, several winters ago a unit I was at tried on the "energy efficiency" scam by keeping the heating off until mid November.
All everyone did, was to go and buy the electric blow heaters and leave them running nearly 24/7, not too long after that a decree came down that they were a fire hazard and not authorised for use in service accommodation. The poor electric meter nearly spun into orbit, but the heating went on sharpish so a moral victory against the penny pinchers.
ALWAYS assume NEVER check