Your Furnace Is Heating Your Attic (The Duct Leak Nobody Checks)
Long-form12:20Education
Published Sep 28, 2026, 5:30 PM · 2w ago
Ray Dutton's Garage
30.6K subscribers · median 7.9K views
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Description
🔧 Everything I learned fixing HVAC for 25 years, in one plain-English book.
📘 THE HVAC SURVIVAL GUIDE - get it here: https://raydutton.com
Last winter the back bedroom never warmed up, so you called someone out. He listened to the furnace run and wrote you a quote for a bigger one. Nine thousand dollars. The furnace was never the problem. In a lot of homes, a quarter of the heat or more never reaches a room. It leaks out of the ducts running through the attic, and the furnace just runs longer to make up for it.
In twenty-five years of service calls, not one company I worked for sent me up there to look for this. In this video I show you the five places the heat gets out: the squashed duct, the duct that lost its insulation, the leaky joints, the duct that fell right off, and the return leak that can pull your furnace's own fumes back into the house. For each one I show you how to check it yourself with a flashlight, a kitchen thermometer, or a tissue, what the fix costs, and when it's a job for a tech.
The fix for most of it is a tub of sealing paste that costs about twenty dollars. And I'll give you the one question to ask before anybody writes up a new furnace.
CHAPTERS
0:00 The $9,000 quote for a cold bedroom
0:46 1. The squashed duct
2:17 2. The duct that lost its wrap (the thermometer test)
3:47 3. Leaky joints and the $20 fix
5:46 4. The duct that fell off (where the big quote comes from)
7:42 When a room really is cold for another reason
8:26 5. The return leak
9:05 The dangerous spot: right next to the furnace
10:17 The tissue test and your CO alarms
11:19 The recap
11:42 Your Saturday list
Tell me in the comments what state you live in and how old your furnace is. I read every one of them.
I'm Ray Dutton. Keep your cool, and I'll see you in the next one.
#ductwork #furnace #hvac #heating #ductleaks #homemaintenance #hvactips #carbonmonoxide
Tags
leaky ductsattic ductworkduct leaksone room coldroom won't heat updisconnected ductflex ductduct masticseal ductworkduct insulationreturn air leakfurnace backdraftcarbon monoxidebigger furnacefurnace too smallhvac scamRay Duttonheating billfurnace efficiencyduct sealing costattic insulation ductscold bedroom fix
Details
- Published
- Sep 28, 2026, 5:30 PM
- Length
- 12:20 (740 s)
- Format
- Long-form
- Category
- Education
- Audio language
- EN-US
- Quality
- HD
- Captions
- Yes
- Made for kids
- No
- Licensed content
- Yes
- Video ID
- Wdu-y_wkowI
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