The highest-impact factors
- Number of supply vents and returns
- Number of separate HVAC systems
- Heavy contamination or unusual debris
The next layer
- Duct material and layout
- Cleaning method and equipment
- Access conditions such as attics, crawlspaces, upper floors, and roof terminations
Keep the comparison fair
Count the vents before requesting estimates and tell each contractor the same number of systems and requested services. Ask them to separate optional work from the base job so one quote does not look artificially low or high.
Keep going
These guides answer the next questions homeowners usually hit when comparing a duct-cleaning quote.
Price the actual job, not the headline number.
Use your vent count and ZIP to build a planning range, check researched local benchmarks, then compare nearby contractor options.