Some double pane wood windows in the Greensboro, South Carolina home that we built in 1985 have started to leak air. What is the expected life of today's ENERGY STAR replacement vinyl windows?
There's plenty of room outside our sunny south-facing living room in Madison, Wisconsin, to add a sunroom of about 6 x 14 feet. I'd like 4 x 6' well-insulated windows all along the 14-foot south side, and well insulated walls and ceiling. If left open onto the existing living room year 'round, do sunrooms like this increae, decrease, or not affect utility bills?