My units are gas filled?
All units are gas filled air is a mixture of mainly
Nitrogen and Oxygen, some sealed units have Argon or Krypton gas installed,
these heavier gases help with the unit’s thermal performance
However, as the seal has failed the heavier gases
have long escaped and been replaced with moist air, you could consider
replacing the unit with another heavy gas filled unit that will fail again in
another 5 - 10 years.
Any money you might save by the
slightly better thermal performance of heavy gas filled units will never pay
for new units every few years.