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Hi Sheila, are you getting any heat from the furnace?
So the problem is that it's not heating the house up adequately?
Is it colder than usual where you are? Do you have a programmable thermostat and the heat was turned down over night?
Ok, then the mostl likely explanation based on your description is that your furnace is undersized and is not able to keep up with the unusually cold weather.
I'm assuming the furnace is running, the burners are firing. Yes it should be fine when things warm up some.