Gas heaters, solar heaters and heat pumps are all efficient ways to heat a home. The most efficient method will depend on the house it is being used to heat.
Good insulation and solar heaters are the most cost-efficient ways to warm a house in the long run. The initial cost is higher than other forms, but they are cheaper for continuously use. The insulation will help the heat stay within the home longer. This means less energy will have to be used to warm the house. Solar energy is free once the set up is complete and is better for the environment because it harnesses natural energy instead of relying on fossil fuels.