premise: something positive is desirable sent2: as a system / device grows old , the amount of energy will used by the system / device will increase sent3: energy is a kind of resource sent4: old is the opposite of new sent5: using less of a resource has a positive impact on the resource sent6: an impact is a kind of result sent7: a heating system is a kind of energy resource sent8: to use less of something means decreasing the use of something sent9: energy is used for heating a building by a heating system.
hypothesis: a desirable result of a new heating system is decreasing the amount of energy used