Is $10,000 to redo all ducting a fair price?
Project Details
We moved into a 2,300 sq ft house, 1,400 first floor and 900 second floor. We have a 4 ton blower unit, that a company came in and diagnosed with a cracked heat exchanger due to restricted airflow. It turned out to not be cracked as I listened to advice here and had another company come and remove and inspect it. Essentially, a surface defect. The original company said since I have nine 6” ducts and one 8” duct, I’m only producing about 1000cfm total. And with a 14” return duct in the upstairs attic to the downstairs garage, 1,200 cfm returning. There’s also a 12” duct going upstairs, which goes through the attic and then walls. Therefore, I’m starving the system which should be at 1,600 cfm, which is why the heat exchanger cracked (even though it actually isn’t cracked). I was there with the technician and as far as I was aware he didn’t use any software for duct design, just went by duct size. He wanted to do a hood flow analysis at each register but the kids were napping so I declined. I'm looking for professional opinions on what to do to improve the overall system.
Quote Details
The quote is to redo all ducting in the house. The original company diagnosed a cracked heat exchanger (later found to be a surface defect) due to restricted airflow. They determined the system is starved, producing only about 1000cfm total, while it should be at 1600cfm. The current ducting configuration includes: - Nine 6” supply ducts - One 8” supply duct - One 14” return duct from the upstairs attic to the downstairs garage - One 12” duct going upstairs through the attic and walls
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More Details
Category
HVAC
Price
$10,000
Quote Date
February 1, 2026
Home Size
2,300 sq ft
System type
Furnace
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