$2.)$ A one$-$room building has the following dimensions:

Floor and Roof $=75-0^{\text{'}\text{'}}$ I $50-0^{\text{'}\text{'}}$

Total Height $=20-0^{\text{'}\text{'}}$

The walls have a combined $"R"$ value of $20,$ the roof $"R"$ is $25,$ and the loss through the SOG is $2Bt\frac{u}{f}\frac{t^2}{h}r.$

The outside temperature is $25F,$ and it is desired to keep the interior temperature @ $75F.$ There are $2\mathrm{.}0$ air$-$changes per hour.

What is the rate of heat transfer to the interior? $(10$ pts$.)$

Express this in Horsepower. $(10$ pts$.)$