Originally Posted by fjacky
Just bought a house. It's approx 10-12 years old. It has a mid efficient furnace. Is it worth looking into upgrading it to a high efficient one? Personally I think we are ok. I am just going to make sure the ducts are sealed around the unit itself. I feel the $$ would/could be spent better elsewhere.
How are you determining that it is mid efficiency? Do you have records of the temp it was set at for both heating and cooling? Do you have records of the number of days that the temp was set at, including heating degree days? How do you know that the previous home owners did not jack around with the thermostat every time they felt too warm or too cold? Do you have at least five years of utility bills to show what the previous homeowners were spending to heat, cool, and leave the lights on in every room, along with running the dryer and washer all the time?
There is no real way to determine efficiency of the unit, until you use it for a couple of heating & cooling seasons. This past Summer was brutal on people for air conditioning. Get the windows updated if they are single pane, get the doors fixed to not let air out. Run the numbers through http://hes.lbl.gov/consumer/
Use the detail part, when you get to describing the home info.