Housemates won’t let me put the heating on and it’s making my asthma bad

My housemates won’t let me have the gas central heating on because it’s expensive they said. We have it on for 1 hour at 5pm each day. It’s a badly insulated house.

They’re moaning now that the electricity bill is double this month, I work from home and have to have a little fan heater on just to keep warm, I wear a hat and blankets and jumpers and thermals. But still the house doesn’t warm up above 12 degrees Celsius.

My asthma is so bad since I moved in :(