Hello, I am a civil engineering student and I am currently taking a project design class that requires a bit of overlap into the mechanical field of thought. We have designed a 3-story108,339 sf. building that needs energy-efficient HVAC&R systems, among other things. Being a civil engineer, I have limited knowledge on the subject and am seeking advice. After doing some research, I have noticed that condensing boilers have high efficiencies and would like to look into those; however, I am at a loss as to how powerful of a heater I would need, or even how many. Can you guys help me? Thanks.