1. The problem statement, all variables and given/known data A heat pump is used to heat a building. The outside temp is -5.0 Celsius and the temp inside the building is to be maintained at 22 Celsius. The pump's coefficient of performance is 3.8, and the heat pump delivers 7.54MJ as heat to the building each hour. If the heat pump is Carnot engine working in reverse, at what rate must work be done to run it? 2. Relevant equations Kc = QL /(QH - QL) = TL/(TH-TH) 3. The attempt at a solution I am lost, help, Am I using the right equation, what do I do first. I have tried this many times and I just need help understanding what I am looking for and how to start to get it.