In Plain English
Quick Answer
An HVAC system with separate indoor and outdoor components connected by refrigerant lines.
Definition
Definition
An HVAC system in which the refrigeration components are split between an indoor unit (air handler or evaporator coil) and an outdoor unit (condensing unit), connected by refrigerant piping. Split systems are the most common residential and light commercial HVAC configuration. They offer quieter indoor operation than packaged units because the noisy compressor and condenser fan are located outside.
Context
Why It Matters in Bidding
Split systems are the default HVAC approach on most residential and light-commercial bids, so estimators must scope both the indoor and outdoor units plus the refrigerant line set, electrical, and condensate piping that connect them. Misreading tonnage, efficiency rating, or line-set runs can leave the mechanical bid short, and long refrigerant runs or roof-mounted condensers add labor and material the drawings may not make obvious.
Example
Example
Pricing a tenant build-out, the HVAC estimator counts four split systems on the plans and adds line-set lengths, condenser pads, and a crane pick for the rooftop condensers that the floor plan alone did not capture.
See Also
Related Terms
FAQ
Questions Contractors Ask
What costs are easy to miss when bidding a split system?
Beyond the indoor and outdoor units, estimators frequently overlook the refrigerant line set length, condensate drains, condenser pads or roof curbs, disconnects and whips, low-voltage thermostat wiring, and startup or commissioning. On rooftop installs, rigging or crane time can be a major line item the plan view does not reveal.
How does SEER rating affect a split-system bid?
Higher minimum efficiency ratings required by code or specs raise equipment cost and can change unit sizing and electrical loads. Estimators should price the exact efficiency tier the specs call out rather than a baseline unit, because substituting a lower-rated condenser to win the bid creates a compliance and warranty exposure after award.
Split system versus packaged unit: which is cheaper to bid?
Packaged units combine all components in one cabinet and can cut installation labor, but split systems often cost less in equipment and suit spaces lacking roof access. The right choice is usually dictated by the specs and building layout, so estimators price what is specified rather than swapping configurations to chase a lower number.
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