- As a system / device grows old , the amount of energy will used by the system / device will increase
- Energy is used for heating a building by a heating system
- So, as a heating system grows old, the amount of energy used by that heating system will increase

- As a heating system grows old, the amount of energy used by that heating system will increase
- Old is the opposite of new
- So, if a heating system is newer then the amount of energy used by that heating system will decrease

- Something positive is desirable
- Using less of a resource has a positive impact on the resource
- Hence, using less of a resource has a desirable impact on the resource

- Using less of a resource has a desirable impact on the resource
- An impact is a kind of result
- So, using less of a resource is a kind of desirable result for that resource

- Using less of a resource is a kind of desirable result for that resource
- To use less of something means decreasing the use of something
- Hence, decreasing the use of a resource is a kind of desirable result for that resource

- Decreasing the use of a resource is a kind of desirable result for that resource
- Energy is a kind of resource
- Therefore, decreasing the use of energy is a kind of desirable result for an energy resource

- If a heating system is newer then the amount of energy used by that heating system will decrease
- Decreasing the use of energy is a kind of desirable result for an energy resource
- A heating system is a kind of energy resource
- Hence, a desirable result of a new heating system is decreasing the amount of energy used

Therefore, a desirable result of a new heating system is decreasing the amount of energy used
[Question]A family installs a new heating system in their home. Which is the most desirable result of the new heating system?
[Context]- Something positive is desirable 
- As a system / device grows old , the amount of energy will used by the system / device will increase 
- Energy is a kind of resource 
- Old is the opposite of new 
- Using less of a resource has a positive impact on the resource 
- An impact is a kind of result 
- A heating system is a kind of energy resource 
- To use less of something means decreasing the use of something 
- Energy is used for heating a building by a heating system