I currently have an old Evco/Coleman HP and Furnace---about 20 years old. I'm thinking about replacing it with a new split/dual system: Heat pump (seer 16) and either a 80% or 96% gas furnace. Does anyone know of a website or spreadsheet that I can input my current utility costs (gas rate/electric rate) and then get an idea of the difference between the various efficiencies ?
I don't need exact figures, just something like: "If I'm paying a hundred bucks now, how my less with ...........this or that model and rating."
Another thing I'm wondering about is how much more efficient in terms of electric use are the new H.P.'s and furnaces compared to my 20 year old stuff.