The truth is windows aren’t made to last forever. If you’ve lived in your home for a while or moved into a home that has not replaced windows in a few decades, it’s time to replace them again. Failing to do so can cause problems for your home comfort and might even cost you. Old windows get failing marks when it comes to energy efficiency, letting too much heat escape and causing higher HVAC bills. They can cause the value of your home, which is constantly fluctuating, to decrease. And the longer you have your old windows, the longer you’ll go without enjoying the advances from newer, more energy-efficient windows.