My condo is harshly big, undoubtedly old as well as difficult to temperature control. The weather in our local area makes both heating as well as cooling necessary. Along with struggling to achieve year round comfort, the cost of running the oil furnace as well as cooling system has a major impact on the budget. When we first moved into the house, there were concerns with the air duct, oil furnace as well as cooling system; However, even having the duct proposal cleaned as well as sealed as well as replacing the heating as well as cooling unit didn’t solve all of the problems. The condo was not tightly sealed. All of us dealt with drafts, cold as well as sizzling spots as well as our conditioned air leaking out through gaps in the thermal envelope. While caulking, weatherstripping as well as insulating helped a lot, we needed to upgrade the windows. The majority of energy losses can be blamed on windows, but my condo has twenty-more than four windows of assorted sizes. Many of them were painted shut as well as all of them were single pane as well as super old… Replacing them was an costly project, especially since I wanted to purchase Energy Star rated, thermal pane options. Most of the windows required custom ordering due to their different sizes. I started replacing the windows a single at a time as well as l acquired how to complete the replacement on our own. It took myself and others over more than four years to finally have all new windows in the home. I have noticed a significant improvement in comfort as well as utility costs. There is far less temperature fluctuation from a single room to another.The oil furnace as well as cooling system no longer need to run as often or as long.