Calculate Savings

Simple way to Calculate Your Airgon’s Performance

Your meter records how much Gas units you have used, and works out how much you owe your supplier each month.  It does this by calculating the amount of units in Kilowatt Hours (kWhs) against the price you pay per unit.  (Your tariff).

You also pay a Standing Charge which covers the cost of supplying your home with gas and electricity. You pay a fixed daily amount for this, regardless of how much energy you use - and even if you're not home. Suppliers can't charge more than the price cap, although they may charge less.

It’s important that you understand how you are charged but most people don’t bother leaving it too their supplier, However, this might not be the case now as price have rocketed and every penny counts.

  1. The simplest way of calculating energy usage is by adding up the total consumption in kWh over the measurement period (12-months) before installation and measurement period post installation to ensure that the consumption profile is similar.
  2. Deduct the post installation figures from the pre installation figures and record the difference.
  3. Calculate the percentage difference by subtracting the before value from the after value; then divide by the before value. Multiply the result by 100. Add a % sign and that is your percentage change.

To Calculate how much money, you have saved 

You can calculate the savings reasonably accurately by looking at historical consumption by month and how much you have been charged.  Consumption is less variable than tariff so this is better for domestic measurement.

  1. Consider the month on month expenditure (billing) checking that a.) the rate /cost per kWh hour and b.) standing charge are the same.
    1. If you have changed supplier the rate you are charged may be different particular this year 2022 where the cost per KwH has risen exponentially.
  2. This is slightly more complexed but can be easily achieved with a spreadsheet or just a piece of paper and calculator.
  3. With a column for kWh and a column for £ you can easily calculate the SUM of each column.
Because heating is driven by outside temperature you can also add degree days into your calculation by looking up the temperature in your postcode.  We will produce a video of how to do this shortly but in the interim, have a look at