Start with one site brief
List the property and rooms, existing AC type, available drawings, units to retain or replace, desired changes, ceiling and shaft constraints, building access rules and the planned finish date. Ask the contractor to identify anything that still needs a survey. A short visit may be necessary where concealed routes or existing electrical provision are unknown.
Compare the same scope
Scope line | Ask each contractor to specify |
|---|---|
Equipment | Model and capacity proposal, retained equipment and who supplies each part. |
Air and refrigerant routes | Ducts or pipe runs, return-air route, insulation, and what is excluded behind closed ceilings. |
Drainage | Route, connection point, pump if proposed, access for later service, and test responsibility. |
Electrical | Supply and control cabling scope, interface with the building electrician, and readiness assumptions. |
Controls | Thermostat or controller models, valves and fan-speed interfaces where applicable. |
Ceiling and finishes | Access hatches, openings, making good and coordination with other trades. |
Checks and handover | Which checks occur, what is recorded, and which open items remain for a later visit. |
Keep allowances and exclusions visible. A quote should say whether a ceiling opening, a new electrical circuit or a drainage change is priced, provisional or outside the contractor's scope. An unspecified item is not automatically included.
Why the route needs a survey
DENAIR's Meadows record found copper lines and drainage obstructing a duct route in a confined shaft. At Burj Khalifa, plenums had to align with a marked future ceiling height and sprinkler constraints. At Victory Heights, eight units were pressure tested and seven indoor units connected to power and controls in one recorded stage. Those are distinct installation steps; the record does not prove whole-system commissioning. None of these examples supplies a transferable price.
Ask how the work will be accepted
Request a room-by-room equipment list and a written schedule of checks that fits the proposed system and manufacturer instructions. Separate installation, power/control connection, start-up, drainage verification and final handover. If another contractor must finish a ceiling, supply power or grant access first, note the dependency and who will report completion.
Use the same scope sheet to compare revisions. Ask for a written explanation of any change after opening a ceiling or inspecting a concealed route. The lowest initial total may represent a smaller scope; the comparison is useful only when the omissions are visible.
Next step: Send DENAIR your plans, equipment list, ceiling constraints and the quote lines you want clarified. See [AC Installation](/services/ac-installation) for the relevant service scope.
Duct fabrication at the Meadows site illustrates one installation scope line, not a transferable quote.
Explore the relevant scope
Share the equipment, the rooms affected, previous work and available access. DENAIR can assess the relevant scope.