| Manufacturers of Furnaces are like Politicians                Manufacturers tend to rely on tidbits of information to  claim that their furnace is the best home heater on the market. One furnace  might get a 10th of point higher on the AFUE scale and claim that they  have the highest efficiency furnace. Another furnace manufacturer might get a  little more airflow out of their furnace and claim to have a higher calculated efficiency.                 Some claim they have the quietest furnace when in fact they  have nearly the loudest furnace. Some exclaim outrageously satisfied clients and  use that as a basis for claiming that they have the best home furnace on the  market.                 You Really Shouldn't Believe Any of It                It is all true, to a degree, and it is all false, to a degree.  Homeowner satisfaction surveys are usually taken within a day or two of the  installation. These tests are nearly always higher in approval than if the satisfaction survey  is taken 3 months to a year after ownership.                  Sound Surveys                These are skewed by where the test is taken. The amount of  airflow through the ducting, the level of gas going through the furnace and the  construction of the home. There are too many variables that can be taken  advantage of for the tests to be taken seriously.                 Efficiency Surveys                Efficiencies can vary with an adjustment of the air fuel  mixture, the amount of airflow across the heat exchanger and the amount of Btus  contained within the gas itself.                 Computer Programming                Most furnaces and air conditioners are not even tested for  their efficiency rates in actual use. They are tested using computer  programming and simulations. It was only a few years ago when the Federal  Government and AHRI (testing institute) found out that 1 in 4 coils failed to  achieve the efficiency the manufacturers were stating. One manufacturer had a  100% failure rate.                 Enough of the Negative – Here is Some Positive                The best furnace on the market is one that is installed the  best. The one that follows the Uniform Mechanical Code and the manufacturer's installation  instructions. There is virtually no difference between a 95% AFUE furnace and a  96% AFUE furnace. The majority of the efficiency in an heating system is contained  within the ducting and plenums. We can make an old 80% AFUE furnace every bit,  or more, efficient than a brand new 96% furnace when the system is upgraded to  Energy Star standards.                 Quiet Applications                Even the noisiest furnace can be quieted down with the  correct installation techniques. Properly sized ducting and sound baffles in  the return air chamber help tremendously. Insulated cabinets and furnaces sized correctly  for the application lower noise greatly.                 Reliability                If you recognize the brand name of the furnace, then chances  are it is a reliable furnace. The number one reason for furnace breakdown, by  far, during the first couple of years of operation is poor installation  techniques. The number one reason for furnace breakdown after those first  couple of years is a lack of proper yearly maintenance. It isn't the furnace  causing most of the breakdowns. Permits                Have your furnace installation inspected. The inspector will  help to ensure that the contractor installed your furnace up to code and up to  the manufacturers recommendations. |