Does StopWatt lower your electric bill?

Start with how you're actually billed

Almost all US residential electric meters measure and bill real power, expressed in kilowatt-hours (kWh). They generally do not bill homeowners separately for reactive power the way many commercial and industrial meters do. This distinction matters because power-factor correction primarily targets reactive power. For the underlying concept, see what is power-factor correction.

What StopWatt changes, mechanically

StopWatt uses capacitors to supply reactive current locally to nearby inductive loads (motors, compressors, pumps) instead of that current traveling the full length of your home's wiring. This can reduce total current in the wiring and reduce small resistive (I²R) losses inside your walls. See how it works for the full mechanism.

Where that translates to a bill difference — and where it doesn't

What StopWatt does not do

• It does not change what your meter measures or records.
• It does not generate, store, or return electricity to the grid.
• It does not reduce the actual energy consumed by resistive appliances.
• It does not replace attic insulation, air sealing, or HVAC maintenance as a savings lever.

Weighing it honestly

How to find out for your specific home

1. 1

   Record your baseline

   Pull kWh usage (from your bill, not the dollar total) for the last two to three cycles.

2. 2

   Install near inductive loads

   Place units near your largest motors, pumps, or compressors, following the installation guide.

3. 3

   Hold your routine steady

   Keep thermostat settings and habits consistent for one full billing cycle.

4. 4

   Compare kWh, not dollars

   Check the new cycle's kWh against the same month a year earlier to control for weather.

If it doesn't move the needle for you

That's a legitimate possible outcome given how residential billing works, which is exactly why we back every order with a 60-day money-back guarantee on the purchase price. We would rather you test it and return it than keep a product that isn't doing anything for your specific home. Every order from this official store includes free worldwide shipping, delivery in 1-2 business days to processing, and a 60-day money-back guarantee on the purchase price.

Other places to put your effort

If your home is mostly resistive load, a plug-in device won't be your biggest lever. Our how to lower your electric bill and energy saving tips pages cover broader options like insulation, thermostat scheduling, and appliance timing. You can also try the electricity cost calculator to model your own usage.