An Oklahoma homeowner says they replaced roughly 100 feet of ductwork three separate times, only to watch the same problem keep coming back.
After years of failed flex-duct repairs in the crawl space of a 1929 house, the homeowner ultimately turned to mini-splits — a move that may resonate with anyone tired of paying to fix the same energy-wasting problem over and over.
Here's what to know
In Reddit's r/HvacAdvice, the homeowner described an ongoing duct issue at their 1929 house in Oklahoma, where hot, humid weather puts heavy demand on cooling systems. They said the flex ducting is routed through the crawl space and that the problems have persisted since they moved in during 2021.
According to the post, three separate licensed HVAC contractors have each come out and replaced damaged flex duct sections. With those fixes failing to end the problem, the homeowner asked if there is a tougher material that is still light enough for DIY work or if hard ducting would be the better choice under the house.
The failures have also affected cooling performance. During one hot summer, the owner said the AC "struggled to keep the house under 80," and an inspection below the house revealed flex ducting torn down in multiple spots. The issue came back after a plumbing leak and has resurfaced again.
That kind of repeated failure can become expensive fast. If cooled air is escaping into a crawl space instead of reaching the living area, homeowners are essentially paying for electricity that is not delivering comfort where it is needed.
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More background
The case reflects a common frustration in older homes: A repair may technically get a system running again without addressing the underlying weakness that caused the failure in the first place.
Flex duct can be appealing because it is lightweight, relatively easy to install, and often cheaper upfront than rigid metal ducting. However, in damp crawl spaces — especially in older homes with leaks, moisture issues, or limited clearance — it may be more prone to sagging, tearing, or being pulled down if it is not properly supported.
In the case of this homeowner, after hearing advice from the comment section on Reddit, they discovered local cats and a possum were regularly getting into the crawl space and causing issues with the HVAC system.
The financial burden extends beyond the repair bill. Replacing the same ducting three times means paying repeatedly for labor and materials while also absorbing higher cooling costs whenever the system leaks conditioned air into an unconditioned area.
Fed up with the repeated repairs, the homeowner added two mini-splits. In situations where ductwork keeps failing, a ductless setup can be attractive because it bypasses the damaged air-distribution system entirely.
What can be done?
Repeating the same repair may not be the cheapest path. If you're experiencing similar issues, it's important to consider that rodents could be part of the problem.
And, if you replace a problematic HVAC with a highly efficient upgrade, it could help save you the trouble of expensive repairs while cutting down your energy bills.
If the duct system itself is the weak link, ductless mini-splits may offer another solution. They can cool specific rooms without sending air through damaged ducts, which means less wasted energy and no need to keep paying to rehang the same sections beneath the house.
The best choice will depend on layout, budget, and climate. When a repair keeps recurring, a different system design may save more money than another round of patchwork.
For this homeowner, the frustration was easy to summarize.
"This whole system seems like a failure waiting to happen," they wrote, adding that after hearing the same recommendation again and again, "I feel like I'm just treading water here."
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