I just want to point out right away that I am not sure if this stack exchange is the most appropriate for this question - perhaps Stack exchange Chemistry or Physics would be more suitable?
I live in Canada so our winters are pretty cold and I often hear that turning the temperature down in our house during the day (when we're away) and during the night (when we're sleeping) and only turning it back up when we need it saves energy. But I am wondering, is the following assumption correct? :
The total heat dissipated by a house will be the same regardless of the interior temperature.
This makes sense to me, the same house (same isolation, same emplacement etc...) will lose the same energy no matter if it's interior temperature is 21°C or 23°C.
Note : For this question, I am only interested by electric heating (no gas, no wood ...)
I have a few theories as to why turning down the heat when we don't need it might be true but I would love for someone to confirm them.
- The efficiency of electric heaters depends on the intensity at which it's running (letting it run all day at 50% might be less efficient than letting it run for a few hours at 100%) This could perhaps be related to how the metal elements resist to electricity at different temperatures?
- The sun in the morning helps heat the house quicker and gives the illusion that it takes less energy to heat the house in the morning?
Can someone confirm whether or not it is true that turning the temperature down in our home when we don't need it is more energy efficient and also maybe confirm or deny my hypothesis?