Carpet cleaning, air duct cleaning and dryer vent cleaning in Brooklyn Park, your city’s plan names Champlin first.

Brooklyn Park’s own plan says over half the housing supply here went up between 1970 and 1989, 14,210 units of it, and that roughly a third of the whole stock was built in the one decade from 1970 to 1979, and the census says the same thing from the other side with 9,983 of the city’s 30,682 homes dated to the seventies. That’s the exact era of the deep unlined sheet metal trunk with branches coming off it, which is the system a rotary brush was built for, and we’re inside one most weeks.

The median home in Brooklyn Park was built in 1978, so the typical one is about forty eight years old, and 55.1 percent of the housing here was standing before 1980 with 22.6 percent of it up before 1970. The city puts it in its own words too, that it’s seeing its housing stock age as some of its neighborhoods were built in the 1950s and 1960s, and that it’s answered that with a rental and property maintenance program.

When the village incorporated in 1954 it set a development border at 85th Avenue to hold down the cost of running services out, and as late as the early 1980s Brooklyn Park was still fully developed south of 85th and undeveloped north of it, so tell us which side of that line you’re on and we’ve already got most of what we need. South of it the ductwork tends to be as old as the house even where the furnace isn’t, because a furnace gets swapped out and the metal it feeds stays where the builder left it.

About 6,333 owner households here, close to three in ten, have been in the same house since 1999 or earlier, and 3,242 of them since the 1980s, which is a lot of people who never had a move that put the ducts in front of them. We can’t tell you from a website that yours have never been opened and we won’t, but we’ll tell you what we find when we cut in, and if they’re clean enough already we’ll say that and put the tools back in the van.

There are 7,831 households here with somebody sixty five or older in them and 6,468 of the city’s workers do their job from inside the house, so there’s a lot of the day when someone’s breathing whatever the returns are moving. It’s the same three things at every house, powerful vacuum, compressed air and rotary brush, and all three of them go in every time. We sometimes cut more than two access points in the trunk lines. We never charge for more than two.

18,498 of the homes here are detached houses and another 4,544 are attached townhomes, 75.1 percent of everything in the city, and 71.8 percent of the occupied ones are owner occupied, which is a good deal lower than the towns around us, so plenty of the people reading this are renting and it’s their landlord’s call rather than theirs.

10,046 households in Brooklyn Park have a child under 18 in them, and the city’s own plan tracks average household size going from 2.75 in 2005 to 2.88 in 2010 and 2.93 in 2015, which is more feet on carpet that was laid for fewer of them. So most of what we’re cleaning here is one floor’s worth of wear, because a rambler puts a whole household’s traffic on a single level and it all comes down on the same run of hallway between the bedrooms and the door.

It’s truck mounted hot water extraction, which means the vacuum is a great deal bigger than anything we could carry through your front door, so it takes back enough of the water it puts down that a carpet we clean in the morning is dry by that evening in normal conditions.

The city describes its own early housing as a compact or gable roofed rambler with a large picture window and a detached double garage, and there are 4,544 attached townhomes on top of that, including what the plan calls hundreds of one level townhomes it counts as senior friendly. A rambler and a one level townhome both put the dryer on the same floor as the wall it vents through, so the end we need to get at isn’t twenty feet up a gable.

Townhome runs are the ones that fill up, because a shared wall pushes the duct sideways through the building before it can get outside, so it’s long and it’s flat and lint settles in it. One limit, and it’s printed here rather than said in your driveway. Ground level only. We do not do roof vents or anything twenty feet up.

Brooklyn Park’s plan runs a photo of one subdivision per decade and names every one of them: Crescent Ridge for the 1950s, Cherokee for the 1960s and again for the 1970s, Colorado for the 1980s, Fairway Estates for the 1990s, Woodland Trails for the 2000s and Oxbow Creek for the 2010s. Tell us which one you’re in on the phone and we’ve got the age of your ductwork before we’ve left Champlin.

The city isn’t finished either, with over 90 percent of it developed and about 793 acres still available in the northwest growth area on top of the infill and redevelopment sites, so if you’ve moved into something new up past 85th then the ducts in it were open to the dust of the whole build long before the house was ever yours.