My heat bill is up $100. But that's ok. It will be better next year. I have big plans for insulating it the right way that will help keep the heat bills down.
In the meantime, my plants are not only safe from the cold, they are growing and blooming! But we have the worse of winter yet to come. Dh thinks I should drop the thermostat down some. It won't get any warmer than 15ยบ above the outside temps anyway.
It's only money.