Map the routes before choosing a format

For each option, mark indoor and outdoor equipment, refrigerant or water connections as applicable, drainage, electrical supply, controls and the route for service access. Check the intended ceiling height, structural and building constraints, and where grilles or indoor units would be visible. Ask the designer which assumptions require opening a ceiling or measuring the site.

The Meadows record (10656) found copper lines and drainage obstructing a duct route through a confined shaft. At Burj Khalifa, plenum positions were adjusted to a marked future ceiling height (4724–4725). At Victory Heights, planning included heat-load considerations and fresh-air installation (11081). These are different sites, not a controlled comparison of split against ducted equipment; they show why concealed routes and room design belong in the decision.

Compare like-for-like proposals

Ask both bidders to list the rooms served, equipment and model assumptions, drainage, electrical works, control zones, ceiling and finish works, commissioning checks and exclusions. Include later access to filters, fans and drains. If one quote leaves ceiling making-good or power provision to others, mark that before comparing totals.

Choose the configuration after a survey and a design suitable for the property. No project record here establishes that one type is universally cheaper, quieter or more efficient.