As they say a picture is worth a thousand words
A single picture can tell you so much
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See it.
It all begins with seeing it for yourself. Do you want to know where your house or building is losing heat? Do you want to see if there is a problem?
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Understand it.
It helps with understanding what is happening.
Is your house missing insulation? Is your house colder than you expected?
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Correct it.
It all ends with getting the issue corrected.
Maybe it is missing insulation, maybe it is a hole that leads to greater air leakage.
Once you know what the problem is you can then get it corrected.