Make a decision
Advertised price versus written scope
One scope
An entry price may cover a narrow task and exclude access or repairs.
The other scope
A written estimate itemizes components, labour, protections, verification and extras.
A concrete example
A $99 teaser and a larger itemized quote may describe completely different work. Align cabinet, blower, coil, ducts, access and testing before drawing a price conclusion.
Which question settles it?
Compare totals only after aligning the work; substantial unexplained gaps merit a second opinion.