economical (adj)

Choosing energy-efficient appliances can be a more economical option in the long run, as they consume less electricity.
Carpooling with colleagues is not only environmentally friendly but also an economical way to share commuting costs.
The economical use of raw materials in the manufacturing process contributes to cost savings for the company.
Investing in a programmable thermostat can lead to more economical heating and cooling of your home.