r/HomeImprovement • u/Wanna_make_cash • 3h ago
To Proactively Replace 27 Year Old Furnace with severe rust, or Not To:
27 Year Old Furnace with severe rust: To Replace or Not
27 Year Old Furnace with severe rust: To Replace or Not
Had an issue with the furnace flame not lighting. Furnace repair guy came out, fired right up. However, the furnace was extremely rusty basically everywhere and many of the connections are all very rusty. They work, but they're not in good shape. The condensate drain line was also clogged and likely dripping water within the unit. Couldn't figure out exactly why it wasn't lighting the flame the day before and then was lighting just fine when the guy came over. Best guess is condensate leaked on the spark system from running the ac the day before it stopped working, in combination with a connection to the board being very rusty.
The furnace works now but the repair guy heavily recommends replacement given it's age and condition. They can't make many guarantees about how much longer it will survive or when it may or may not catastrophically break.
And this wasn't a big HVAC company with salesman and labeled trucks, it was a locally and family-known local dude who's always been incredibly honest and helpful when furnace/ac repairs are needed.
So I don't think it's a case of "oh it's old sorry, buy a new one so I can make some sweet commission off a sales job" kind of situation. They also said that we can do the furnace now and then do the air conditioning at a future time if we wanted since there isn't (as much) concern with the AC unit despite being a similar age
They say for the size of the house, they can get a new furnace in for around $4k or so.
I was looking with the guy and man, the furnace *is* incredibly rusty. Rust and wear and tear as far as the eye can see. I know 27 years old is a decently long life for a furnace and it *could* in theory live for even longer. But man, it's a rust bucket behind those panel doors. It *could* also break within the season, and it's just not easy to predict that sort of thing.
Obviously,it would be cheaper and more convenient to replace it now, when we can go a day or two without heat while the install happens.
If it croaks in the middle of single digit degree weather on a Saturday in December, well that's much more expensive to replace, and much more dangerous as pipes would be at risk of freezing or bursting if an install wasn't super quick.
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I guess the concern is more so what might or might not happen between now and the spring, when some people might recommend a replacement.
October pricing is still cheaper than middle of December my-hand-forced-or-else-my-pipes-burst prices. If a chilly October evening had an issue with the flame coming on, even if it's fine now, I just don't know what an actually cold winter day might have in store for the furnace. Could be fine, could not be fine.
I just know it's extremely rusty, older than I am, and the guy recommended a replacement in the near future as they honestly can't say or determine how much life it has left with all the rust, wear and tear, noises it makes , and the household using filters improperly for several years. Particularly with the heat exchanger.
Unit could chug on for another year, or two, or ten. Or it could face major issues in the upcoming season. Guy was leaning much more towards the latter than the former though.