What is the most cost influential heat? i need to put a foreign heater surrounded by my house because...

i need to put a foreign heater surrounded by my house because my house is 50+ years old. It have baseboard which is very expensive. I be thinking of a heat pump or infrared heat. What do u know about this ?
Answers:    A combination of
geothermal,
solar and
conservation (insulation, simplified design).

You might want to seriously research heat pumps - they aren't necessarily what some head you to believe...
Long johns and wooly jumpers.