E. a bicycle path. Practical Reading Regular tune-ups of your heating system will cut heating costs and will most likely increase the lifetime and safety of the system. When a service technician performs a tune-up, he or she should test the efficiency of your heating system. The technician should measure the efficiency of your system both before and after servicing it and provide you with a copy of the results. Adapted from Alex Wilson and John Morrill, Consumer Guide to Home Energy Savings .
Bolded headings appear only in the sample test.
B. heating system only needs minor repairs and will most likely function for a number of years. C. temperature of the flue will be lower than expected. D. heating system cannot be repaired and must be replaced. E. costs for running the heating system will decrease. B. modify the heating system before initially measuring efficiency.