165W of heat load is a start, remember. You will probably have a significant load coming from insulation leaks as well. In other words, work with 165W as your lower bound. I'll be honest and admit that I don't even have a decent ballpark figure to estimate the amount of heat leaking into your system though.
Also, the conversion factor from Watts to BTUs is 3.41. Each Watt is 3.41 BTU/hr (a Watt is a measure of power (over time), and a BTU is an instantaneous measure of energy).
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