How to determine your annual natural gas consumption?
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For windows: $30 per square metre of eligible windows replaced up to a maximum of 7.5% of the cost of purchase and installation of the new windows.
For walls and roofs: $8 per square metre of eligible walls or roofs renovated up to a maximum of 75% of the cost of purchase and installation.
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By phone at 1 800 361-4568 or by email.