Heating a house in the most effective manner

[samv]

In your opinion, what is the most energy efficient way to heat a house (in Canada or Northern US) and why? What is the least efficient and why?

Best regards,
samv

 

[MarauderX]

http://hvac-talk.com/vbb/

Least efficient is electricty IMO, as it comes down to cost.

Most efficient would depend much on location.