I know the purpose of tiny houses is green living and energy efficiency but how much is the difference based on 2 people?
With only 2 people, I don't think there would be such a drastic difference. In larger houses what can drive up energy consumption is leaving the lights or HVAC on in unoccupied areas. Also, some families have the habit of leaving the outdoor lighting on all night long. I believe energy consumption has to do more with habits than actual home size.
If 2 people living in a normal house have the same habits as 2 people living in a tiny house, I don't think energy consumption will be drastically different.
In reply to JGomez:
Thanks, I guess heating has a lot to do with it? I live in a city in Central America with tropical climate, where space heating is virtually non-existent and water heating is used every once in a while. Central AC units are also extremely rare in residential settings... most use a mini-split for each room. As a result, sometimes you see large houses or apartments with only 1 or 2 people and very low energy bill. At a given time, most of the house/apartment is in the dark and without air conditioning.