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The Disemboweling of Purgatory, Part 4: Ducts

Posted on September 18, 2016March 8, 2025 By stega

As noted in the previous posts, we had our furnaces tuned up and a new thermostat installed for one of them. The next step was getting the ducts cleaned. Neither the Furnace Man nor American HVAC and Plumbing really do such work, so we made a call–well, really sent an email–to Clear Thumb. A few emails back and forth and we agreed to have them come out to do the work.

Of course, this being Purgatory, it wasn’t as simple as that. Turns out our ducts were ZOMG so incredibly dirty. That’s the only way to describe them–well, the only way that does not use profanity.

Concrete proof

So a few mornings ago, Juan and Enrique arrived and set up to work. We were super impressed–they unpacked the contents of their van, set up a table outside with all their equipment so they had a workspace, walked through the house to get the lay of the land and then set to work. Since they started in the north end of the house, I moved the boys to their play stand in the studio and dragged their cages outside to clean them so no one would be in the guys’ way. By the time I was done with the cages, Juan and Enrique were done with the first few vents. It was a long day though, as we had 27 of the 29 vents/air returns cleaned. (We didn’t bother with the vents in the downstairs area of the great room as we plan on decommissioning those.)

And what dirty ducts we had. The guys said they normally have to make two, maybe three passes with the brush-vacuum device and usually change its brush only every few jobs. Given the previous owners’ inability to do any preventive maintainence, they went through a couple of brushes that day as each vent required at least six full passes to become acceptably tidy. To give you an idea of just how nasty things were, here are some before and after shots. (The guys sent me these images after they were all done so that I could write this post.)

A typical vent shaft:

Vent shaft before cleaning
Vent shaft before cleaning
Vent shaft after cleaning
Vent shaft after cleaning


A main duct shaft (yes, that is a tiny creature skeleton in the foreground):

Main duct before cleaning (no extra for rodent skeleton)
Main duct before cleaning (no extra for rodent skeleton)
Main duct after cleaning
Main duct after cleaning

Looking straight down into a vent:

Down into vent before cleaning
Down into vent before cleaning
Down into vent after cleaning
Down into vent after cleaning

Then there was the busted vent we’d known about since the initial house inspection. They addressed that issue as well:

Busted vent before
Busted vent before
Busted vent after repair
Busted vent after repair

Once all the ducts were cleaned, they fixed all the vents so that our less-than-even-marginally-efficient furnaces would be slightly more efficient by making sure all the vents were straight, sealed and insulated. Then all the register covers which they thoroughly cleaned were put back in place.

Register cleaned out
Register cleaned out
Register insulated
Register insulated
Register sealed
Register sealed

The guys ended up working for close to 9 hours, and while obviously the amount of dirt and grime meant we went over the original cost estimate (the decision to better seal the vents also meant additional costs), but it was definitely money well spent. We intend to keep the diesel furnaces for at least a few more years, as we have more pressing projects to which to apply the monies.

Added bonuses: the guys had to move a bookshelf away from one of the return vents and it was too heavy, so they removed books from some of the shelves. Juan took a picture of the books as they were on the shelves, so when it came time to put things back as they were, they used it to get them all back in their original spots. Also, when they were done they walked through the house with a backpack vacuum and sucked up any dust left over from the process, so when they left it was like they hadn’t even been here. Of course we know they were and this winter we will certainly appreciate the work each time the furnaces boot up, as we will no longer smell hot dust and who knows what else. Now all that remains is to have the crawlspace under the house cleaned out, the insulation redone, the hot/cold water pipes insulated and any holes to the exterior sealed up. We hope to get that done sometime this month.

Lastly, the shot at the top of this post is of some of the concrete they pulled out of the vents. Seems when the previous owners had the bathrooms redone the contractors were not very tidy.

Projects, Update Tags:Furnace

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