I have a Trane XV80 two-stage furnace (80,000 BTU input) that is probably nearing the end of its lifespan (almost 25 years) and want to be informed when it comes to a potential replacement.
Based on what I have read, this unit has an output capacity of 41.6K BTU on low and 64K BTU on high. The existing furnace almost never runs on high except for a few minutes during recovery. I recall only a few situations in which the high stage was (briefly) called for during steady state operation, and it would have to be in the mid-teens (mid/north Georgia location, rare) for that to happen and it has been a few years since I noticed it doing this -- air flow is acceptably quiet on low but the return grills will resonate faintly on high, so it's quite apparent when the high stage is activated.
So, it seems like if I went with a 90%+ replacement, a 60K BTU input furnace is likely to do the job. But what about an 80% 60K BTU replacement? This would put out 48K BTU on high. I'd expect much longer and even continuous running with more high stage operation, but I'll note the existing furnace cycles on low even with outdoor temps in the low 20's. (The furnace is in sealed crawlspace hung horizontally from the floor joists, so a combustion air intake for a 90% furnace would probably have to be added.)
Based on what I have read, this unit has an output capacity of 41.6K BTU on low and 64K BTU on high. The existing furnace almost never runs on high except for a few minutes during recovery. I recall only a few situations in which the high stage was (briefly) called for during steady state operation, and it would have to be in the mid-teens (mid/north Georgia location, rare) for that to happen and it has been a few years since I noticed it doing this -- air flow is acceptably quiet on low but the return grills will resonate faintly on high, so it's quite apparent when the high stage is activated.
So, it seems like if I went with a 90%+ replacement, a 60K BTU input furnace is likely to do the job. But what about an 80% 60K BTU replacement? This would put out 48K BTU on high. I'd expect much longer and even continuous running with more high stage operation, but I'll note the existing furnace cycles on low even with outdoor temps in the low 20's. (The furnace is in sealed crawlspace hung horizontally from the floor joists, so a combustion air intake for a 90% furnace would probably have to be added.)
source https://hvac-talk.com/vbb/showthread.php?2225743-Size-of-potential-replacement-for-XV80-Trane-furnace-based-on-existing-behavior&goto=newpost
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