Rooftop Package Unit Service & Replacement in Phoenix Metro, AZ

A package unit holds the whole system in one cabinet: compressor, both coils and the blower. On many older Valley homes, especially flat-roof ranch and block houses, that cabinet sits on the roof and connects straight down into the ductwork. There is no indoor air handler and no equipment in the attic.

Rooftop units are simple and easy to work on once you are up there, but the location is brutal. Absolute Air AZ repairs and maintains package heat pumps and gas-electric package units, and handles full crane replacements when a unit reaches the end of the road. You hear the flat-rate price first, and emergency AC service is available 24/7.

Signs your rooftop unit needs service

• Water stains on the ceiling near the unit or along its drain line
• Loud rattling or vibration you can hear through the roof
• Weak airflow from every register in the house
• The unit runs but the air is not cold
• Breaker trips on hot afternoons
• Rust, loose panels or missing screws on the cabinet
• Crumbling insulation or gaps where the ducts meet the unit
• Summer bills that climb each year

Why so many Valley homes have rooftop units

Flat and low-slope roofs were a popular way to build in the Phoenix area for decades, and many of those homes started life with an evaporative cooler on the roof. When refrigerated air conditioning took over, the package unit went in the same place and used the same duct openings. Some homes still have both, with a damper to switch between them.

The layout has real advantages. Nothing takes up closet or yard space, the noise stays outside and overhead, and every component can be reached without crawling through an attic. The trade-offs are sun, heat, wind and the fact that you never see the unit, so problems stay hidden longer.

Package units come in two main types here. A package heat pump cools and heats with electricity alone. A gas-electric unit, often called a gas pack, cools with electricity and heats with a built-in gas furnace.

What the roof does to your equipment

On a summer afternoon, the roof surface is much hotter than the air, and the unit sits right on top of it in direct sun. The condenser has to reject heat into that environment for hours on end. Capacitors, contactors and fan motors age quickly, and the compressor runs at high pressure through most of the day.

Sunlight is hard on everything else too. Wire insulation turns brittle, plastic drain fittings crack, and the gaskets and duct insulation at the base of the unit dry out and crumble. Once those seals fail, cooled air leaks onto the roof and hot air gets drawn in.

Then the monsoon arrives. Strong outflow winds shake panels loose and drive rain sideways into places that normally stay dry. Dust packs into the condenser coil, and hail can bend the fins flat. A check after a major storm is worthwhile.

Common rooftop package unit repairs

Many rooftop failures are the same electrical parts that fail on any air conditioner, just sooner: capacitors, contactors, condenser fan motors and blower motors. These are typically straightforward repairs.

Others are particular to the rooftop setup. A clogged condensate drain overflows onto the roof and can find its way through to the ceiling. Duct connections under the unit separate. Roof flashing around the stand or curb cracks, and what looks like an AC leak turns out to be a roof leak, or the reverse. We trace the water to its source before recommending a fix.

• Capacitor, contactor and motor replacement
• Condenser coil cleaning and fin straightening
• Condensate drain clearing and re-piping
• Sealing and re-insulating duct connections
• Refrigerant leak diagnosis
• Gas heat section repairs on gas-electric units

How a crane replacement works

Replacing a rooftop unit is a different job from replacing a ground-level system, because the equipment weighs several hundred pounds and has to be lifted over the house. A crane truck sets up in the driveway or street, lifts the old unit off and sets the new one in a single visit.

The lift itself is quick. The work around it takes longer: disconnecting power, gas and drain lines, inspecting the stand or curb, replacing the duct transition and seals, setting the new unit level, reconnecting everything and sealing roof penetrations. New units rarely match the old duct openings exactly, so an adapter or new transition is often part of the job.

We also check access before the day of the lift: overhead power lines, trees, carports and how close the crane can park. Permit and HOA requirements vary by city and community, and we will walk you through what applies to your address.

Replace on the roof, or convert to a split system?

When a rooftop unit wears out, most homeowners replace it with a new package unit in the same spot. The ductwork is already there, the electrical service is already there, and the changeover is fast.

Some homes can be converted to a split system, with the condenser on the ground and an air handler indoors or in the attic. That gets the equipment out of the sun and off the roof, but it needs space for the air handler, new refrigerant lines, new duct connections and often electrical changes. On a true flat-roof home with no attic, it is frequently impractical.

We look at your home and give you an honest read on both. Your in-home consultation costs nothing and can often happen the same day, and our online price request lets you tell us about your home before we ever visit. A new system carries a 10-year warranty on parts and labor (ask us for full warranty terms). Financing partners offer zero-down and same-as-cash options, subject to credit approval.