the structure of an A1 atom using the following terms, protons, neutrons, electrons, ionization energy, engry levels, atomic mass, and isotopes.
First, you need to contact your local building inspectorThat would be with your city, town or village officesAsk the inspector to see if the correct size system was installedThe inspector may have or know of a legal course of action you can takeThe inspector will also have a list of qualified contractors of which one you will obviously needMake sure you have all of your records and follow-up with legal action if it can not be resolved by any other meansSecond, please report the contractor to the Better Business Bureau? Also, you may have an internet site for your area where people like yourself can make it known which contractors are good or bad.
The unit is too small for the houseEfficiency is in relation to fuel used to BTUs, not that less BTU will heat the same as moreMe thinks you got taken.
I think the furnace is too small for your house, regardless of how efficient it is or how much better it runsMaybe you could invest in an Edenpure unitThey're great.
I would call a furnace techIt sounds like you have a jet problem, or an air mixture problemEither way it will end up costing you moneyIf you keep running it it's going to use a tremendous amount of gas, and soot up the furnace.