Basements are notoriously chilly because most of them are below ground level. Space heaters are okay but most of them are expensive unless you go with something like a wood or coal stove and can get the fuel free. If you have someone put grilles in your basement duct you may want to ask the installer to bring the duct down to floor level for the grille outlet. The reason for that is that heat rises and if the vent is in the ceiling as soon as the fan stops the heated air will start going back into the opening that it came out of.

I hope that helps.

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