Replace worn weatherstripping and outdated frames with tight-sealing units that stop drafts, cut condensation

https://iad.portfolio.instructure.com/shared/808516acf5eb4e9acaed52551b4b3e2fff9f0d47a08e7757

Replace worn weatherstripping and outdated frames with tight-sealing units that stop drafts, cut condensation, and lower heating costs across London.