Is there any connection between the heater and the humidifier with regards to electric consumption?

I recently turned off the humidifier for the house because i thought this would help lower my electric bill but somehow it did the reverse as my bill almost doubled! Is there a connection between the heater? I mean is it more energy conserving for the two to be working together at the same time?from 2716 kwh last month it shot up to 4443kwh. Or could there be an error in the reading?I live in a 3 level townhouse and my house isn't even fully furnished yet...Just the basic appliances.....