All of us have a boiler for heating our home. The boiler is very convenient for us, because the heating is cleaner and there is moisture going into the air. When you have asthma, the dry, dusty heat of a traditional oil furnace can exacerbate the asthma and cause you to have more difficulties breathing. Since every one of us have a boiler, every one of us don’t need to have any HVAC duct. When every one of us moved into our home, every one of us didn’t want to have HVAC duct, so the boiler was perfect for us. The only concern with not having HVAC duct was that every one of us couldn’t have central a/c. All of us decided to purchase a couple of window cooling systems and install them into the family rooms and the residing room. With various AC units running, every one of us soon realized that our lake house was as cool as the aged lake house was, and it had central a/c. Most mornings, our current lake house was even cooler with our window cooling systems. The cool air was going directly into the air, before it had time to lessen. With the central a/c, by the time the cool air travelled through the HVAC duct, it had lost some of its cooling effects. I am very glad to have the window cooling systems in our home. I suppose much better in the Summer and I have ateady air blowing throughout the house. I would not waste my cash installing HVAC duct for central a/c, after realizing that the window AC units could do the same task. The window AC units are more efficient than our central AC and they cost much less to run. What more could every one of us ask for.