Replace a rooftop package unit in Georgetown

Updated September 2026 · ATX Mini Split King, Austin and Central Texas

Georgetown has older houses near the square, ranch homes in established neighborhoods, and plenty of additions. Some low slope roofs still carry a packaged rooftop air conditioner. Summers here are long and hot. ATX Mini Split King is an independent HVAC and electrical contractor in Austin and Central Texas. Work is done to code by a TDLR licensed contractor. This page explains the rooftop system, its limits, and what a ductless mini split replacement involves. Call (512) 297-7493.

Flat pricing, everything included

Those are materials and labor together, wired to code by a TDLR licensed contractor. Anything non standard gets quoted first, before a single tool comes out of the truck: a very long line set, an electrical panel that needs work, a difficult mount, a roof or masonry penetration, disposal of the old equipment. You hear the number before we start, not after.

What a packaged rooftop air conditioner is

A packaged rooftop air conditioner is a single outdoor cabinet that holds almost the entire cooling system. The compressor, the outdoor coil, the indoor coil, and the blower all sit together in that one box on the roof. On many Georgetown buildings this cabinet also includes a heat source, so the same unit tries to cool in summer and heat in the short winter. Supply and return ducts punch through the roof deck and run into the rooms below. The refrigerant loop never leaves the cabinet. Air from the building is pulled up, treated in the box, and pushed back down the ducts. That is different from a split system, where the noisy parts sit outside on the ground and the indoor coil sits in an attic or closet.

You see these units on small commercial buildings along the main corridors in Georgetown, on some churches and offices, and on a smaller number of houses with low slope or nearly flat roofs. Older ranch houses and later additions sometimes ended up with a package unit because it was simpler to set one box on the roof than to run a split system through a tight attic. Converted garages, sunrooms, and upstairs bonus rooms in established neighborhoods often share that story. The unit sits on a curb or rails, with flashing around the duct openings. Rain, hail, and the Central Texas sun hit the cabinet all day. Because everything is in one place, a leak or a failed blower is all in that rooftop box, not spread between yard and attic.

How it works day to day is simple. A thermostat in the space calls for cooling. The blower in the rooftop cabinet pulls return air up through the ducts. That air passes over a cold coil inside the same box. Heat leaves the air, moisture often condenses, and cooler air is pushed down the supply ducts into the rooms. The heat that was removed is dumped to outdoor air through the condenser section of the same cabinet. In heating mode, if the unit has a gas section or a heat pump, the same blower moves warm air instead. There is no indoor air handler in a closet and no line set on the wall while this system is still in service. Filters sit in the return grille or in the unit, so a lot of service work means getting on the roof.

Why people still run a rooftop package unit

People keep these units for practical reasons, not because they are glamorous. One cabinet does cooling and often heating, so there is no second machine in a closet or attic. In older Georgetown houses with small mechanical closets, or in additions that never had a good place for an air handler, that matters. The yard stays clear. In neighborhoods near the square and in tighter lots, keeping the noisy equipment on the roof instead of beside a bedroom window is a real benefit. If the existing ducts still move air evenly, the package unit uses what is already built. For a small office or a shop, one rooftop box is easy to understand and easy to replace with another rooftop box. Service is concentrated in one place.

A package unit can heat and cool a whole zone with one thermostat, which is enough when the building is a simple rectangle and the ducts were sized with some care. It does not need a refrigerant line set snaked through walls, so there are fewer holes in finished interiors. For a converted space that already has roof penetrations, keeping the same layout avoids opening up plaster or old siding in historic parts of town. The equipment is out of reach of lawn mowers, dogs, and kids. After a hail storm, the damage is on the roof, not in a side yard. In a mild Georgetown winter, even an aging heat section or heat pump can keep indoor temperatures acceptable without much drama. Those are honest reasons the unit is still there.

When the ducts are short, sealed, and in conditioned space, a rooftop package unit can feel even and quiet indoors. Some Georgetown additions off a ranch house have a short duct run from a roof curb into a single large room, and that arrangement can work well for years. Commercial suites with a simple open plan are another case where one box on the roof matches the layout. Owners who already budget for roof access and who have a sound curb and flashing often prefer to stay with what they know. The system is familiar to many technicians. None of that makes it the right tool for every building, but it explains why a working package unit is not automatically a problem. If it still cools through August and the ducts do not leak badly, it is doing a real job.

Limits of a packaged rooftop unit

The same one-box design that keeps the yard clear also puts every part in the weather. Georgetown summers cook the cabinet. Hail dents the coil. Rain finds any weak flashing around the curb and can stain ceilings below. A rusted drain pan or a clogged condensate line on the roof can dump water into the building. Filters and electrical parts live in a hot, dusty box that is awkward to reach. On older houses the roof structure may not have been designed for a heavy unit plus a worker standing next to it. Ducts that drop through a hot attic lose a lot of the cooling before they reach the rooms. In a long ranch house, the far bedrooms often feel weaker than the living room because one blower and one set of ducts are trying to serve everything.

A packaged rooftop unit is almost always a single zone. One thermostat, one blower, one set of ducts. Additions, converted garages, and upstairs rooms in Georgetown housing often need different run times than the original living area. The package unit cannot do that without extra dampers and controls that most of these systems never received. If the compressor fails, you lose cooling for the whole building until the cabinet is repaired or replaced. Roof work is slower and more expensive than working on the ground. Access for a crane or a lift matters on tight lots downtown and in older subdivisions with mature trees. Noise from the blower and compressor can travel through the roof deck into rooms below, especially when the unit is old and the isolation pads have crumbled.

Duct leakage is common in older housing. Tape dries out. Flex duct sags in a hot attic. The package unit then runs longer to make up for air that never arrives. Rooms over the garage, sunrooms, and later additions often stay uncomfortable even when the thermostat in the main hall is satisfied. Getting a filter changed on a steep or aging roof is a safety issue for homeowners. Electrical disconnects and breakers for rooftop equipment can be undersized on houses that have had several additions. None of this means the system never worked. It means the design has real limits in a climate with months of high outdoor temperatures and in a housing stock full of extra rooms that were not in the original plan. Those limits are why some owners start looking at ductless equipment.

Signs a rooftop package unit is failing

A rooftop package unit near the end of its life often shows it in the rooms first. Airflow at the registers feels weak. Some rooms never catch up on the hottest afternoons, even though the unit runs almost without stopping. You may hear the blower straining or the compressor rattling through the ceiling. Short cycling, where the unit starts and stops every few minutes, usually means a failing component or a control problem. Ice on the refrigerant coil, if you can see it from the roof, points to airflow or charge issues. Water stains on the ceiling under the curb are a warning that condensate or rain is getting in. A rusted cabinet, crumbling insulation on the ducts at the curb, and a pan full of standing water are all signs the box has taken too many summers.

Electrical signs matter too. A breaker that trips on hot days, a disconnect that is melted or rusted, or a burning smell when the unit starts all point to trouble. The heat section may fail while cooling still limps along, which in a mild Georgetown winter can hide the problem until the next summer. Frequent refrigerant leaks from a coil that has been sitting in hail and sun are common on old rooftop cabinets. Once a coil is leaking in several places, repair is a short delay, not a fix. If a technician has already replaced the capacitor, the contactor, and the fan motor, and the compressor is next, the cabinet as a whole is worn out. Roof flashing that has been patched more than once around the curb is another clue that the installation is at the end of a long service life.

Comfort complaints pile up in additions and converted rooms first. A sunroom off an older house, a garage apartment, or a bonus room over a garage may never have had enough air from the original rooftop unit. When that unit is tired, those rooms become unusable in July and August. You might notice the unit running at night more than it used to, or humidity that will not drop. Dust from deteriorating duct lining can blow into the space. A musty smell after the system shuts off often means standing water in the drain pan. None of these signs by themselves prove the unit must come off the roof tomorrow. Together they mean you should have a TDLR licensed contractor look at the whole picture, including the ducts, the curb, the electrical, and the actual comfort in each room, before you spend more on parts.

What replacing the rooftop unit with a mini split involves

Replacement starts with the old cabinet. ATX Mini Split King disconnects power, recovers refrigerant, and lifts the packaged unit off the curb. On many Georgetown jobs that means a lift or a crane because the box is heavy and the roof is not a place to slide equipment. The curb and the duct openings in the roof remain. Those openings get framed, insulated, and weatherproofed so the roof is closed again. Flashing is repaired or replaced so rain does not follow the old path into the ceiling. Abandoned ducts in the attic can be capped and left, or pulled if they are in the way. The customer decides whether any of those ducts will stay in service for a remaining central system, or whether the whole building will go ductless. That choice drives how many indoor heads you need and where they go.

A ductless mini split puts a compact outdoor condenser on the ground or on a wall bracket, and one or more indoor heads on interior walls or ceilings. The line set, two small refrigerant pipes plus control wiring, runs from the outdoor unit to each head. Condensate from each indoor head is drained by gravity or a small pump to the outside or to a plumbing drain. On a typical Georgetown ranch or addition, the line set often follows an eave, a chase, or a short attic run, then drops to the outdoor unit on a side of the house that is not the front. Electrical work includes a dedicated circuit, a disconnect at the outdoor unit, and sometimes a new breaker. If the panel is full or outdated, a panel upgrade is quoted before work starts. Awkward mounting and long line sets are quoted before work starts as well.

A standard one indoor head job, materials and labor included, is $1,500. Two indoor heads are $2,500. Three indoor heads are $3,500. Those figures cover typical mounting, a normal length line set, condensate, and the electrical circuit when the panel can take it. Anything non standard is quoted before work starts. In a day the crew removes the rooftop unit, patches the roof openings, mounts the outdoor unit, hangs the indoor heads, runs line set and condensate, completes electrical, vacuums and charges the system, and starts it up. The customer has to decide head locations, which rooms matter most, whether to keep any ducts, and where the outdoor unit can sit without blocking a path or a window. Historic exteriors and HOA rules in some Georgetown neighborhoods may limit where the outdoor cabinet can go. ATX Mini Split King walks that with you before tools come out.

When we will tell you to wait

We will tell you a mini split is not the right call when the rooftop unit still cools the whole building evenly and the ducts are in decent shape. If a capacitor, a contactor, or a fan motor is the only problem, repair is cheaper and faster than a full change. ATX Mini Split King will say so. If the building is a simple open plan and you already have a sound curb, replacing the package unit with another package unit can be the cleaner path. You keep using the ducts you have. You do not add indoor heads on walls. You do not run line sets. For some small commercial spaces in Georgetown, staying with a rooftop box is still the right mechanical choice. Do not switch just because a neighbor did. Switch because rooms are uncomfortable, ducts are failing, or the cabinet is truly worn out.

Waiting a season can be the better call when the failure happens in October and you can heat the space with space heaters or the remaining heat section through a short, mild winter. That gives time to plan head locations, check the electrical panel, and get roof patching done in better weather. If you are about to sell the house, a full ductless conversion may not be what a buyer in an established Georgetown neighborhood expects. Some historic interiors should not have wall heads. If only one addition is miserable and the main house is fine, a single mini split for that addition, while leaving the rooftop unit on the main house, can be smarter than ripping everything out. Indoor heads need wall space and a condensate path. If every good wall is a window or historic plaster you do not want to cut, stay ducted or repair.

Do not switch if your electrical panel cannot support another circuit and you are not ready to pay for a panel upgrade. That work is quoted before anything starts, and it can change the timeline. Do not switch if you need even air in many small rooms and you are not willing to put a head in each one or accept that closed doors will block comfort. A mini split does not push air through ducts into every corner. It treats the room where the head sits. In a long ranch with many bedrooms, that can mean more heads than you wanted, or a decision to keep ducts for the main house. ATX Mini Split King is an independent HVAC and electrical contractor. If repair, a new rooftop unit, or waiting until spring is the honest recommendation, that is what you will hear.

Questions people actually ask

What happens to the hole in the roof when the package unit comes off?

The curb and duct openings stay until they are closed. The crew frames the opening, adds insulation where it belongs, and weathers in the roof so water cannot follow the old path. Flashing is repaired as part of making the roof tight again. Abandoned ducts below can be capped. This is not a cosmetic tape job. It has to keep rain out through Central Texas storms. If the roof deck is rotten around the old curb, that repair is quoted before work starts because it is not standard. You should not have an open hole overnight.

How is the work priced for a rooftop to mini split swap?

A standard job with one indoor head is $1,500, materials and labor included. Two indoor heads are $2,500. Three indoor heads are $3,500. That assumes typical mounting, a normal line set, condensate, and a panel that can take a new circuit. Long line sets, a panel upgrade, awkward mounting, extra condensate pumps, crane time beyond a simple lift, and rotten roof deck repairs are quoted before work starts. ATX Mini Split King does not start until those extras are in writing. Call (512) 297-7493 to walk the building.

Will a ductless system heat as well as the old rooftop unit in winter?

Georgetown winters are short and mild. A mini split in heat pump form can keep rooms comfortable for that climate when the head is sized and placed for the room. It will not blow the same kind of hot air a gas pack on the roof used to dump through ducts. It warms the space where the head is. Closed doors and far rooms without a head will be cooler. If you rely on very warm supply air, or if you have a large open volume with high ceilings, say so during the walkthrough. Staying with a ducted heater for the main house can be the better winter plan.

Can I keep the rooftop unit for the main house and add mini splits only in additions?

Yes. That is often the honest plan in Georgetown, where ranch houses gained sunrooms, garage apartments, and enclosed porches over the years. The original rooftop unit can keep serving the core if it still works and the ducts there are decent. A mini split then treats the addition as its own zone. You avoid overloading the old ducts and you avoid putting heads in rooms that already feel fine. Electrical still needs a dedicated circuit for the new outdoor unit. Line set and condensate have to reach the addition without tearing up the whole house. If that run is long or awkward, it is quoted before work starts.

Who does the electrical work and is the contractor licensed?

ATX Mini Split King is an independent HVAC and electrical contractor in Austin and Central Texas. Work is done to code by a TDLR licensed contractor. The same crew plans the circuit, the disconnect, and the indoor connections. If your panel is full or the service is too small, a panel upgrade is quoted before work starts. You are not left to hire a second company for the wiring on a standard job. Older Georgetown houses often need a close look at the panel. That happens up front so the price includes the electrical path.

Keep reading

Every replacement guide we have written is listed on the replacement guide hub. Next door to this page: replacing a packaged rooftop air conditioning unit with a ductless mini split in pflugerville, replacing a packaged rooftop air conditioning unit with a ductless mini split in kyle. Pricing, service area and the quote form all live on the ATX Mini Split King home page, and the Austin mini split cost guide covers what the rest of the market charges.