[Sherman Logan]

Heating the house by light bulbs isn’t very efficient, and it’s expensive to pay for the A/C to offset their heat during the summer.

The comparative advantage varies with source of your heat.

If you heat with electric resistance, then the waste heat from light bulbs is exactly as efficient as that from your heaters. Just about any other source of heat is more efficient, though.

[dangerdoc]

Unless you live in Florida or California, I hope your electric heat is from a heat pump, not a resistor. Converting electricity directly to heat is expensive.