It is recommended in the EcoServe Energy Saver review to use one EcoServe Energy Saver device to cover an area of 1000 square feet. If your home or business is more than 1000 square feet, then it is best to use multiple EcoServe Energy Saver devices so that the device remains effective.

https://www.emailmeform.com/builder/emf/officialwebsite/ecoserve-energy-saver