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There are many available options. Let me know what is most important to you. Brand? Efficiency? Costs?
If you are looking for a high efficiency furnace at a good price, check out the Goodman GCH95 model.You will need to order the LP kit along with the furnace.
LP kit needed will be determined by your elevation.
If you are looking for a standard efficiency check out the GDS8 series
80 % dedicated downflow
95% dedicated downflow:
All of these will wor without a lot of ductwork changes.Possibly a slight plenum transition.