I am in the process of replacing my 16 year old Rheem Furnace (75% efficiency - 125K BTU) / AC (3.5 ton, original 8.8 SEER rating as installed). My house is 2604 sqft, plus 700 sq ft finished basement that does not need alot of heat / AC. My opinion is that the original AC was undersized and the original furnace was correctly sized. Over the 17 years the furnace has needed both fan motors replaced and has developed ignition problems over the last few years (old standing pilot) that will require replacement of the system, not just a new thermocouple or adjustments. I admit, the fan problems may have been due to my failure to initially not pay as much attention to having a clean filter as I should have done. The AC has been a trooper, but has not always kept up on hot days (95+) and we keep the inside temperature at 78 degrees in the summer. No repairs, just annual cleaning and maintenance checks. Although I just had it tested and its effective SEER is now about 4.4 - not good. I am in the process of getting quotes from three different Contractors - all which I have had very good references from and I believe will do a very good job of the installation. The three are providing estimates on the following equipment - I do like higher efficiencies and the 2-stage or variable furnaces and possibly a 2-stage AC or heat pump: Contractor #1: AC/Gas Furnace - Lennox; Heat Pump/Gas Furnace - Airease by Lennox. Recommend 100/110 BTU - 95% eff furnace, and a 5-ton 14+ SEER AC or HP. Did not do an extensive sizing, but has alot of experience in the neighborhood and is familiar with my "cookie cutter" house layout. He did measure ducts to confirm airflow requirements. Contractor #2 - AC or Heat Pump / Gas Furnace - Lennox. Recommend 100/110 BTU - 95% eff furnace, and a 4-ton 14+ SEER AC or a 5-ton 14+ SEER HP. Seemed to base his findings on the house size, but has recently installed systems on almost identical houses in the neighborhood. Contractor #3 - AC or Heat Pump / Gas Furnace - Ruud. Waiting on estimate. Is in the process of completing a heat / AC load analysis. Due to some personal references I am not a big fan or Trane, so that is why I did not get an estimate on that equipment. I am interested in comments on my process thus far and any experience with the equipment being quoted. What is your opinion on heat pumps versus AC? Thank you, Mike PS - I did find the following information (it may ba a couple of years old - but is interesting): The following was from the Lennox International Annual Report to Shareholders that discussed their products and what their competition was: Lennox International: Direct to Dealer Products (Lennox, Armstrong Air, Ducane) Products Through Distributor (Aire-Flo, AirEase, Concord); United Technologies Corp. (Carrier, Bryant, Tempstar, Comfortmaker, Heil, Areoaire, Keeprite); Goodman Manufacturing Company, L.P. (Goodman, Janitrol, Amana); American Standard Companies Inc. (Trane, American Standard); Paloma Co., Ltd. (Rheem, Ruud); Johnson Controls, Inc. (York, Weatherking); Nordyne (Westinghouse, Frigidaire, Tappan, Philco, Kelvinator, Gibson); HNI Corporation (Heatilator, Heat-n-Glo); CFM Corporation (Majestic).