How can I adjust preset apartment boil? The apartment has the grill preset to 69 degrees. The window...

The apartment has the grill preset to 69 degrees. The window are very drafty as ably as the patio doors that are within the main living nouns. I plan to block the drafts, but with a child surrounded by the house we need it furnace. Is there a course to trip the thermostat?
Answers:    depends on how the system is preset to 69. T-stat lock box, or computor controlled or some other method. Need that info to help and what type of system?