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Goodman makes eleven types of gas furnaces, which the company separates into a 'standard-efficiency' class and a 'high-efficiency' class. Efficiency is measured in AFUE, which stands for 'annual fuel utilization efficiency.' The AFUE number reflects the percentage of heating energy that gets converted to thermal energy for a house.
Most of Goodman's furnaces use heated aluminum coils; some have secondary heat exchanges made from stainless steel. They are all gray in appearance and have highly durable finishes to protect their exterior.
Standard Efficiency Furnaces
All of Goodman's standard furnace models list AFUE of up to 80%. The standard efficiency models include:
There are several features distributed among these models, in various combinations.
Multi-Speed. Multi-speed heaters can save energy because they can operate at various different levels depending on the amount of work that needs to be done. Goodman's multi-speed heaters have four different operations.
Variable Speed. Variable speed furnaces operate according to a similar principle, but have the capacity to vary their speed across a continuous range, instead of providing discrete options.
Multi-Position. "Multi-Position" furnaces can be installed in different positions. This might be useful to homeowners who need to fit a furnace into an unconventional location.
Silicon Nitride Igniter. Electric igniters can increase energy efficiency because they don't require gas.
ComfortNet Compatibility. Some of the furnaces are compatible with Goodman's ComfortNet, a system that monitors temperatures in order to create efficient and rapid responses from the heating system. The system includes a thermostat display and can be connected with four wires to the main unit.
Goodman's High Efficiency models include:
These heaters range in efficiency from 92% AFUE to 95% AFUE. Some of this efficiency is due to better insulation; some is due to more sensitive control over the heating function. Many of the same combinations of features as above are available.
Some of the efficient furnaces have two stages, which means that in addition to operating at multiple or variable speeds, they engage a separate component for heavy-duty heating. This process is relatively energy efficient. Two of these models (GCVC95 and GCH95) are downflow furnaces, which means that cool air enters at the top and is heated by rising warmth from the bottom. This is an efficient model because the heat was going to rise anyway.
The 'top model' of this bunch is the GMVC95, which has a 95% AFUE, two stages, and variable speed. It has a dehumidification element and an electronic control board that allows individualized control over its various elements.
Care and Maintenance
Goodman recommends homeowners work with a professional contractor for maintenance purposes, and that they schedule annual tune-ups for their home's central heating system.
Most of these models come with ten-year limited warranties for their parts. The top models also come with lifetime warranties on their heat exchangers . The promise of additional maintenance can be purchased through the GoodCare program.