Why don’t you wish to substitute your gas furnace? I just don’t understand why someone wouldn’t want to fix their gas furnace if their gas furnace was not easily working absolutely well. I am a high tech Heating, Ventilation & A/C professional, plus I deal with people all the time. I am frequently the person that has to tell people that their Heating, Ventilation & A/C items are not easily working absolutely well, plus I really hate doing that because no one wants to think that they have to substitute their gas furnace. Furnaces are costly, and also most people don’t have that kind of money laying around in the first place. But also, I have easily talked to people that get upset when I mention having to replace their gas furnace, however they are not getting upset because they don’t want to pay bills for their gas furnace. These people easily get upset because they are sad that they are going to miss their gas furnace, plus that is really deranged to me. Why would one be upset that they have to get rid of a broken gas furnace? Sure, I think that most use a gas furnace for 15-20 years before the gas furnace finally stops working easily, but I didn’t think that people easily get attached to their gas furnace. Furnaces are generally in some hidden room where people don’t have to think about them. Furnaces are also costly to use, plus it costs a small fortune to have Heating, Ventilation & A/C techs repair them. Why would someone be upset that they have to get rid of a broken furnace? I suppose that some people can’t literally grow attached to the strangest things.