First let us say we have been installing furnaces since 1989 with next to NO repair problems. This includes the 92% versions. We ran a new house HVAC business for 10 years installing not only the furnace, air conditioner or heat pump but all the ductwork, wiring, in other words a complete turn key installation. We did this on between 150 - 200 new homes a year for this 10 year period.
To give you all some insight to why some companies try to discourage you from installing 92% furnaces please read on. Installing these furnaces MUST be done correctly or they WILL NOT work right. Companies who hire inexperienced installers and service people already know they will have problems with the installation. If your basement ceiling is finished with sheet rock it may be difficult to run the P.V.C. flue pipe or pipes to the outside wall of the building. These pipes USUALLY have to run horizontally AND have to have a 1/4" pitch back towards the furnace or air handler. If you don't have this pitch you will get at the LEAST erratic operation of the burners on the furnace or cycling of the air handler.
The size of the flue pipes ( diameter ) runs between 2" and 3". The size of the furnace and the length of the runs of pipe as well as the number of elbows will dictate which diameter of pipe is needed. Here again, if the installer AND the estimator doesn't understand this, you can count on problems! In other words if 3" pipe will be needed SOMEONE has to be sure there is enough clearance to allow for installation AND the 1/4" pitch.
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