
C1 & C2 BER Rating Ireland 2026: What It Means, Running Costs & How to Upgrade
C1 and C2 BER ratings explained for Irish homes in 2026: kWh/m²/yr, running costs, retrofit sequence and how solar shifts C1 into B territory.
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C1 and C2 BER ratings explained for Irish homes in 2026: kWh/m²/yr, running costs, retrofit sequence and how solar shifts C1 into B territory.

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