My parents are doing some renovations/expansions that will certainly call for a bigger system. This one is excellent for a little house and works well. The model is a Lennox 10ACC-018-230-01. $450 OBO. Call Nick at 6479240944 or Puzzles at 2895531171. Do not respond through e-mail as this ad is being published for my parents (which I don't live with) and they don't utilize e-mail. Kindly provide them a call with any type of questions.