We just bought our first house this past winter. It is built in 1979, split level with 3 floors. Roughly 1900 sq. ft. including garage.
So the heating is a Trane XR80, it has a Trane A/C I think is XR14 but unsure of the capacity. My main focus right now is the heat, I'll make new thread in the summer.
It seems it follows the design I hear a lot of negative things about(for a house at least). There is 2 very large return grates, one on the lowest level and the other at the highest with no dedicated room returns. There is very little flow out of the vents in every room except the bathrooms which feed right off the main feed duct. Our master bath literally blows you away as well as the 1st & 3rd floor bath. The 1st floor which is always 5-10 degrees colder recieves hardly any flow. Now it is partially underground on a slab foundation so I am not sure if that is an issue. The only way I can get a somewhat warm first floor temp is to run the fan constantly.
If I do that I usually get 65F when the stat reads 72F in our living room. Our living room is a cathedral ceiling as well so it is always warmer in the dining room & kitchen because of this. In our bedroom someone had the brillant idea to run a uninsulated duct under the floor from the soffet outside to bring in air for the furnace & hot water heater. In doing this our bedroom is usually 5 degrees cooler by default depending on the heat cycling. I can also feel cold air from a light switch by the bed when the fan is on so I also think I have a leaky duct.
It seems to fix a lot of this would be a whole system redesign which I am not really ready for financially and well I don't want our house torn apart as well.
Would a contracter really be able to help with any of this outside of that or is that really my only option?
FYI the heat/cooling was installed in 2002 so it is fairly new. I will glady offer pictures if anything needs to be clarified.
I should also note while our gas bill wasn't outrageous I don't want it to be. Average over 2 months is 84 therms/month which also includes the hot water & cooking gas.