central heating

[Raebs2k7]

The past 2 gas bills of mine has been mind blowing , i stay with my girlfriend and we work during the day so we only have heating on 6hrs at night, i phoned my gas company and they thmselves said it was high , and also they said that i was using twice the number of units i should be using, does any 1 know what this problem could be?

 

[ProffesorPlumb]

Lower your thermostat to 20 degs