Quick answer
- No usable ducts or fast TI schedule → ductless often wins.
- Existing curb capacity and open-plan duct systems → packaged often wins.
- IT closets and odd hours almost always deserve dedicated ductless or separate zones.
When this applies
You are pricing a TI mechanical scope
Landlord shell may allow either path; you need a decision framework before CD freeze.
The existing RTU cannot serve new density
Headcount or equipment loads rose; decide whether to upsize packaged or add ductless.
Aesthetic and ceiling constraints dominate
Historic or exposed ceilings make duct routing painful — ductless heads may be the cleaner path.
Options to evaluate
Choose ductless / VRF-light when
Ducts are absent, inaccessible, or wrong-sized; you need room-level control; or the TI schedule cannot wait for major duct revisions. Tradeoff: indoor heads are visible, condensate and branch piping need careful design, and large open offices may need many heads or a different approach.
Choose packaged RTU when
Roof curb capacity exists, ducts can be reused or modestly extended, and you want centralized filtration/economizer strategy for an open floor. Tradeoff: crane and curb work, less granular zoning unless VAV is added, and setbacks must be designed carefully for mixed uses.
Hybrid TI
Keep or replace the RTU for the main floor; add ductless for conference, IT, and after-hours suites. Tradeoff: two maintenance profiles — document both in the O&M package.
Honest pros & cons
Ductless
Pros
- • Fast TI installs
- • Excellent zoning
- • Minimal duct demolition
Cons
- • Visible indoor units
- • Condensate management critical
- • Can get expensive with many zones
Packaged RTU
Pros
- • Hidden delivery via ducts
- • Central filtration/economizer
- • Familiar for many facilities teams
Cons
- • Crane/curb complexity
- • Weaker room-level control without VAV
- • Harder in duct-poor shells
Failure modes to avoid
Hanging ductless without a condensate plan
Ceiling stains and weekend leaks destroy TI goodwill. Pump and drain design is mandatory.
Overloading an old RTU for a dense TI
Comfort fails on day one of occupancy. Validate load against actual equipment capacity.
Ignoring Title 24 and OA for the chosen path
Both ductless and packaged paths have compliance implications — assign them in the TI budget.
Proof & local context
- • We design and install TI mechanical packages — ductless, packaged, and hybrid — for South Bay and Central Valley light commercial spaces.
- • Bryant-authorized equipment paths where they fit; honest alternates when they do not.
- • CSLB #1056688 · Perfection Guaranteed.
Next step
Decision frameworks reflect light-to-mid commercial HVAC, refrigeration, and server/edge cooling across San Jose / South Bay and Central Valley (Hanford, Clovis). Not for hospitals or hyperscale data centers. Site survey and engineered loads beat generic rules of thumb.
FAQs
Will ductless meet office aesthetic standards?
Cassette and ducted-fan-coil styles hide better than wall heads. Discuss finish expectations early — aesthetics drive equipment choice as much as tons.
Can we keep the landlord’s RTU and add ductless?
Often yes, with clear responsibility for OA, electrical capacity, and maintenance boundaries between landlord and tenant equipment.
Which is cheaper?
For small TIs without ducts, ductless is often cheaper installed. For larger open floors with good ducts, packaged replacement or reuse usually wins. Hybrid can optimize both.