We have good news and we have bad news. Sorry to be the bearer of bad news, but when the last owner removed the blinds he also permanently broke the airtight seal around your insulated glass windows. It is interesting that the last owner had the where with all to disassemble the windows, remove the blinds and reassemble everything without realizing that he was permanently destroying the insulative value of each window that he worked on. The brand you have is probably Pella. They have been making this type of window for a long time. You would be wise to call a Pella dealer and ask to have just the insulated glass sections replaced. Pella will probably be more expensive than a local glass company, but the warranty may be better. With insulated glass warranty is everything. Keep in mind that some window companies now offer lifetime warranties. And that's all there is to it!