Effects on the unit’s thermal
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.
Save Your Windows, Save Your Money,
Save the Environment.