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Effects on the unit’s thermal performance.

Basically, if the unit is air filled the re-engineering has no effect on the thermal performance of the unit, tests carried out and independently verified by a leading University in the UK compared a brand-new unit with an identical pressure equalised unit and the thermal performance was the same.

If you replace the failed unit with a gas filled, warm edge, low thermal emissivity glass unit it will outperform the re-engineered unit, however the saving made on lower heat loss over the next 5 - 10 years will never pay for the cost of upgrading the unit and what's more the unit will most likely need replacing again and again and again.

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