Useful answers.
Understand the working.
Calculators and worksheets for the subjects you study and the problems you meet in practice. Work through an example, try your own values, then test the same ideas in exam practice.
Energy saving comparison
Compare an energy-audit baseline with a proposed equipment input at equivalent service. Keep assumed operating hours visible so an estimate is not mistaken for measured and verified savings.
Open tool →FREE TOOLEquipment efficiency calculator
Draw the boundary between useful output and energy input in an energy-management problem. Distinguish efficiency from a heat pump coefficient of performance.
Open tool →FREE TOOLSimple payback calculator
Include maintenance-cost changes when screening an energy project. Explain why a simple-payback result is not a discounted financial appraisal.
Open tool →FREE TOOLInsulation heat loss comparison
Compare envelope heat transfer using before-and-after U-values. Treat annual equivalent hours as an explicit assumption rather than a weather prediction.
Open tool →FREE TOOLLoad factor calculator
Relate interval energy to peak demand over the same billing period. Reject inconsistent inputs that would make average demand exceed the recorded peak.
Open tool →Tools that connect the calculation to the concept
Each tool shows its method, units and assumptions, together with two worked examples. Example values are for learning; replace them with your own measurements or documented inputs. The related study links take you to the matching certification topic on Energy Cert Exam.
Worksheets run in your browser. We do not send entered measurements or report text to a calculation service. Where export is available, you choose when to save the file locally.
Check the boundary of the answer
A useful result starts with the right inputs and an appropriate method. These tools explain what is calculated and what the method leaves out. User-supplied criteria remain identified as supplied criteria; a calculation does not automatically approve equipment, certify an inspection or establish regulatory compliance.