Answer:
The thermal energy of the house is 
The magnitude of the energy transfer is 
Explanation:
From the question we are told that
The energy content is 
The energy through sunshine is 
Generally the first law of thermodynamics can be mathematically represented as

Where
is the heat transferred
is the change in internal energy with is = 0J the temperature of the house did not change
is the workdone which = 0J This because the volume of the air in the house did not change
Therefore 

And this is equivalent to the thermal energy of the house 
Therefore
= 0J
Now the heat transfer from outside to inside can be mathematically represented as

Now
= 19000 + 2000

This because both the energy of the natural and the sunshine are supplied to the house
And
= 0 this is because there are no transfer of heat to the surrounding
Hence

