The number you will see repeated everywhere is every three to five years. It is a reasonable starting point, and it comes from national guidance which quietly assumes a house that runs heat for four months and sits with the windows open the rest of the year.
That is not how a home in Broward or Palm Beach County works. Your air handler runs close to twelve months a year, and every hour it runs it pulls air through the same ductwork. More running hours means more material moving through the system, and more of it settling where the air slows down.
What actually determines the interval
Rather than picking a number off a chart, it is more useful to look at what is loading your system.
Humidity
This is the South Florida variable. Ductwork here rarely gets a chance to dry out fully between cycles. Dust that would stay loose and inert in a dry climate tends to stay damp, and damp dust behaves differently. It clings, it compacts, and it is a far better home for mould and bacteria than dry dust ever is. That musty smell in the first minute after the system kicks on is usually this.
Pets
Dander and hair are the fastest way to load a return. Two shedding animals will shorten a five-year interval to something closer to two or three.
Renovation
Drywall dust is the worst thing that can happen to a duct system, and it is almost always avoidable. If contractors ran the AC during the work, and in this climate they usually do, that dust went straight into the system. This is the one case where we would say clean it now regardless of when it was last done.
Who lives there
Asthma, allergies, an infant, or a smoker in the house all move the interval down. Not because duct cleaning is a medical treatment, it is not, and anyone selling it that way is overreaching, but because there is no reason to keep recirculating material you can remove.
A more honest answer
For a typical Broward or Palm Beach home with no pets, no recent renovation and nobody with respiratory issues, every three to five years is genuinely fine. Add pets, allergies, smoking or renovation dust and two to three years is more realistic.
What we would not do is put you on an annual schedule. Ducts do not need cleaning every year in a normal home, and a company telling you otherwise is selling a subscription rather than a service.
If a company quotes you a cleaning interval before seeing your system, they are describing their business model, not your house.
What the EPA actually says
Worth being straight about this, because it gets misrepresented constantly in this industry. The EPA does not recommend duct cleaning as routine maintenance for every home. Its position is that it makes sense in specific circumstances: visible mould growth inside the ducts, evidence of vermin, or ducts clogged with substantial deposits of dust and debris.
We think that is a fair position, and we would rather quote it accurately than pretend the agency endorses something it does not. If your system meets none of those conditions and it was cleaned three years ago, you can probably wait.
The signs that matter more than the calendar
- Dust settling on surfaces within a day or two of cleaning
- One room noticeably stuffier or warmer than the rest
- A musty smell in the first minute of a cycle
- Visible debris or dark streaking around a return vent
- Power bills climbing with no change in how you run the system
- Allergy symptoms consistently worse indoors than out
Two or more of those and it is worth an inspection regardless of what the calendar says. If it is time, here is what a full air duct cleaning actually covers, and what it costs in Broward and Palm Beach County. None of them, and a recent cleaning, and you are fine.
Not sure where your system stands?
We inspect before quoting, and if your ducts do not need cleaning yet we will tell you that.
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