One unit of EcoServe is meant for a 1000 sq. ft. This means that for a larger house or even office, one unit needs to be plugged in nearest to the main circuit breaker, while the rest of them should be over 1000 sq. ft from each other. The device/devices do everything else on their own and will probably end up with a 60%-90% reduction in electricity bills. EcoServe is claimed to save energy used by any appliance, however, there are some exceptions. Any appliance that uses a heating element eg. electric kettle, stove, heater will definitely increase the electricity consumption and it will not be able to reduce that. EcoServe that make it a worthy choice and definitely worth buying. It significantly reduces power consumption, leading to a reduction in electricity bills. Has been made to be ideal for common appliances found in homes to offer the best savings. EcoServe is completely heat proof and shockproof, which is a peace of mind knowing one’s house will be safe.