How do you Finding an honest furnace or air conditioner review is hard because everyone is biased in one way or another. I decided to write this furnace review to give my opinion with facts that I have accumulated over the years.I have been repairing and installing furnaces and air conditioners for 29 years so I have a good amount of experience in the subject.I have found that furnaces have evolved over the years to a point now where all of the manufacturers are offering a high quality product that will last many years. When high efficiency furnaces first came out, each manufacturer had its own idea on how to build a furnace and by trial and error they slowly worked out the problems to where now they are all are building a good furnace.The furnace manufacturers actually just build the heat exchanger, cabinet, housings etc. They buy the circuit boards, motors, burners, controls, limit switches, draft inducers, pressure controls, gas valves, ignition controls, and hot surface igniters from the companies that build them like GE, Honeywell, White Rodgers, Robertshaw, etc.You generally read comments about furnace brands that have a negative slant. This is because people who have had a bad experience tend to have the drive to tell the world about it while the people who are satisfied are content to leave it at that. The truth is every brand has to be repaired now and then and since the manufacturers who build the main working parts of the furnaces build them for every furnace manufacturer, I do not see a big difference in number of repairs from one brand to the next.Then how should you choose which furnace brand to buy? It is important to purchase your furnace from someone you can trust to install it properly and who will back up the warranty if something should go wrong later on. I recommend that you try to buy locally so you are important to the business that you are buying from and not just another anonymous customer who does not matter. The manufacturer's warranty is a big factor to look at. If the furnace does break in the future, you don't want to be stuck with a large repair bill. Today you can find lifetime warranties on heat exchangers and 10 years on all other parts. If they don't offer this warranty, keep looking because some do and it is better to let the manufacturer pay for the repair instead of you. After all if they spend all of that money on advertising trying to convince you to buy their furnace let them back it up with a good warranty!My name is John and I own Schuebel's Heating and Air Conditioning in Woodbury Minnesota.I work just in my area so I can be responsive to my customers needs.My website is Woodburyheating.com