The optimal number of Stetzerizer filters needed for a living space varies greatly. Some of the variables in your electrical system that can determine the number of filters needed are:

  • How many circuits you have
  • How many square feet your living space is
  • The condition of the power grid in your area
  • Your neighbors' electrical usage
  • The electronics in your home (computers, TVs, etc)
  • Appliances and lighting in your home

Our preferred method of choosing the right number of filters looks at the two items in bold above: how many circuits are in your breaker panel and how many square feet your total living space (including garage and basement) is.

Count each physical switch as 1, no matter if that switch is taking up 2 spaces or not. Sometimes you can have 2 switches in one space, so then count both switches. Count all switches, no matter what the switch is for (count your furnace/AC, dryer, everything). Some circuits are 240 volt circuits that we cannot put a filter on. However, other circuits will require 2 filters - where you have electronics such as TVs, computers, etc. So it evens out. Just count each switch that you can turn on/off as 1 and add up the total number you have. Write down or remember this number. We recommend about 1 filter per circuit.

Now, take the approximate number of square feet in your total living space. We recommend about 1 filter per 100 square feet. If the number of circuits is different than the number of square feet divided by 100 (1700 square feet would mean 17 filters for example) then we go towards the lower number. For example, if you have 2000 square feet but only 15 circuits, we would recommend trying 16 or 17 filters.

If you have any other questions, please let us know! We would be happy to help you determine the best number of filters to purchase.

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