Start with the question you are trying to answer
If you received a very low advertised price, begin with the offer and quote guides. They explain how to ask what is included, what is optional, whether the amount is a preliminary planning range or a final price, and what written exclusions should be understood before approval. Comparing two providers is meaningful only when the requested scope and access are comparable.
If you are seeing dust, planning after renovation, or managing a commercial property, use the condition and planning guides. An observation can justify documenting what is happening, but it is not automatic proof that cleaning is needed. Check simple possibilities such as when the dust appears, filter condition, visible access points, and whether the concern may require a separate HVAC evaluation.









