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I will dowload a couple of links so you can compare closely
The 987 is a better unit. It is more efficient and considered the higher end Evolution SEries as compared to the Preferred Series which is a step down
The 987 is what is known as a modulating furnace which is more efficient than the preferred series.Look over the two links I sent and let me know if you have specific questions.
If you have further questions, please let me know.
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