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Frequently Asked Questions
What do all rooftop units have in common?
The whole plant sits outside in one cabinet.
The building gives up no floor area to it.
Conditioned air arrives through duct penetrations.
Service access is on the roof, not in the space.
Everything else about them varies.
What divides the group?
How much outside air, and where the heat comes from.
Most units recirculate with a ventilation proportion.
One handles outside air only.
Heating is either a separate section or a reversed circuit.
Those two questions place any unit in the group.
How does a rooftop air conditioner produce heat?
With a separate heating section.
Gas firing or electric elements are both common.
The refrigerant circuit only ever cools.
Heating capacity is independent of outdoor temperature.
The two functions are sized separately.
How is a rooftop heat pump different?
One circuit does both jobs by reversing.
Heating is produced by moving heat, not burning fuel.
Capacity falls as the ambient falls.
Supplementary heat covers the coldest conditions.
There may be no gas connection at all.
Why is a make-up air unit in this group?
Because it is a packaged rooftop machine like the others.
Its brief is different, not its form.
It handles outside air and nothing else.
It replaces air an exhaust system removes.
It works alongside the recirculating units.
Why do curbs and accessories matter on a replacement?
Because they decide whether the unit can land at all.
An existing roof already has a curb on it.
A new unit rarely matches its footprint.
That question arrives before capacity is discussed.
It is the commonest surprise in a changeout.
Do these units serve one zone or several?
Usually one zone each, which is the appeal.
A single unit conditions a defined area.
Several units cover a large floor plate independently.
One failure then affects one area, not the building.
Zoning within a unit is possible but less common.