My battery died overnight and it was because my heater ran all night even though my car was off. Even with the heater in "off" position, the heater still runs.

I disconnected the fuse for the blower, so that it couldn't drain my battery again.

Any ideas how I can fix this? Or what it would cost to have someone repair?

Help, it's cold outside!

 

Are you referring to the blower staying on? It may be the blower motor relay.

See this link:

honda-tech.com/showthread.php?t=2985457