To start, lets get one thing straight!
payback time = initial cost / annual saving
For example, if you pay $200 for lift insulation and save $50 annualy, the payback time will be 4 years. To work this out we take the initial cost ($200) and divide this by the annual saving ($50) to get 4 years - its quite simple when you know how!
This time we have a Hot Water Tank Jacket which costs $15 with an annual saving of $30. This means the payback time will be.... 6 months! Now, this type of example is slightly harder because the annual saving is larger than the initial cost - but this isnt a problem! When we do $15 / $30 we get 0.6 - this is a decimal because this is months, NOT years.
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