Start with the problem you want solved
Start with the concern you are trying to address: visible dust, odors, humidity, ventilation or discomfort.
Holladay: planning the visit
When replacing equipment in an existing home, ask how the proposed system connects to the existing ducts, controls and available mechanical space. Share previous comfort problems rather than only a preferred brand. A useful comparison explains what is reused, what changes and what measurements support the design.
