The warranty provided by the furnace installer included a few yrs parts and several yrs labor for servicing.
Is it reasonable that the installer honors the warranty if I didn't get the furnace serviced each yr?
The warranty that is provided by the installer will depend on their company terms and commitment towards customer relationships. Part warranty by manufacturer is normally 5 year and most manufacturers will extend warranty simply by registering within 90 days of installation. Usually manufacturers warranty includes a term that the warranty may void if furnace fails due to luck of maintenance. However, they don't usually request records of annul maintenance. You can review warranty terms that was provided with furnace by installer, or you can download it from manufacturers website using furnace model number. To be more specific to your question, it would be reasonable to honour warranty if defect is not caused by poor maintenance. For example, defective gas valve is not usually caused by poor maintenance. But water leak, poor combustion, over heating... are mostly caused by poor maintenance.
I hope the information was helpful.
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