Some cleaning methods can harm ducts and most don't do any good. Instead,I recommend pleated filters that catch dust and pollen. Be sure filter fit's the holder. If you can't find a perfect fit,special order them. Look at it like this. If the hvac is putting dust and pollen in the air,it will soon be pulled into return where a good filter catch's it before it can be circulated again.

20 year old duct system is pretty old, if your ducts are made of flex duct or duct board there is a good chance a duct cleaning will not reach the cleanliness of a new duct system.

With that said if you have a 2 story structure, it's unlikely you will have the access needed to replace every piece of the duct system.

So there are trade offs going from replacement to cleaning, not to mention truth in cleaning. How are you going to know how clean the duct system is after the cleaning?

The ads of duct cleaning typically start around $59 a system. At this price point it would be impossible for duct cleaner to stay in business, but that is the con game of this kind of service.

If the duct system isn't thoroughly cleaned, it won't be long until you'll need to do it again.

the duct above is a 35 year old duct. This type are impossible to clean well as the inner part of the duct has a cloth like material.

This supply plenum was replaced recently. I don't know how recently, but you can clearly see the stuff that was growing in the ducts is making it's way toward the cool dark ac supply box.

Here's another picture of same plenum.

Nothing is cleaner, healthier than a new duct system.

I service the Katy, Texas area.

If the floor is open to opinions and Darrel any longer care's,I say use the right filters and there will be nothing in ducts to clean out.

Well, you have some wrong concept about duct cleaning system because by cleaning it will be good going other wise it will be damage day by day. Although, I have less knowledge about this but I know that regular AC cleaning with pressure washer machine is very good step for our air conditioning which I got this amazing trick from FIFTY REASONS. So I am suggesting this to all.

As mentioned above, trying some higher quality air filters might be all that you need. Cleaning ducts that old will be challenging and might not solve the problem. Trying new filters first is cheaper and less stressful and it may work just as well if not better.

Twintech Heating & Cooling

https://twintechheating.ca/