Envi is one of the most energy efficient wall heaters you can find. It uses only 4 cents worth of electricity a hour. You can heat 3 rooms at one time for only 12 cents a day if you have a need to warm more than one room. They also have a programmable thermostat that will run up to three Envi heaters at one time. These high capacity thermostats provide for the greatest number of heaters to be controlled with a single thermostat. They are so quiet but warm your room quickly without drying out the air. Learn more about these amazing heaters at www.eheat.com or call 800-807-0107 .