# Replace a PTAC or through-wall AC with a mini split

> Tired of a loud through-wall unit and its electric heat strip? We replace PTACs in DC apartments with mini splits and close the old wall sleeve properly.

URL: https://roomwisedcminisplits.com/ptac-wall-ac-replacement/

Service

The through-wall unit comes out, a quiet heat pump goes in, and the old sleeve is closed for good.

(771) 213-3105

Last Updated: November 11, 2026

Room by room

Each head sized from a heat-load calculation for its room

Tested

Pressure test and deep vacuum before any refrigerant moves

Drained

A drain path planned for every head before it is mounted

Permitted

A DC Department of Buildings mechanical permit on every install

[Roomwise DC Mini Splits](https://roomwisedcminisplits.com/) replaces PTACs and through-wall air conditioners with mini splits in DC apartments and condos. The box under the window that rattles all night, the heat strip that runs up the winter bill, and the drafty opening around it all go.

Electricity heats nearly half of occupied DC homes, and in a PTAC that heat comes from a resistance strip. A mini split heats the same room with a heat pump and moves the noisy compressor outdoors.

## Why people replace a PTAC

A PTAC packs heating and cooling into one box that sits in the wall. That’s convenient to install once, and it’s also why the unit is loud, leaky and costly to heat with.

- **Noise.** The compressor runs a foot from your couch or your bed. A mini split puts it outside, and the head inside runs only a fan.
- **Heat strip costs.** Most PTACs heat with an electric resistance element; some are heat pumps that fall back on a strip. Resistance heat turns each kilowatt-hour into one kilowatt-hour of heat, no more.
- **Drafts.** The sleeve is a large hole through the outside wall, sealed only by the chassis gasket and whatever foam someone added.
- **Sticky summers.** A loud on-off cycle cools the air without pulling much water out of it. Reagan National’s July dew point averages 66.4°F, so moisture matters as much as temperature.

A mini split’s inverter compressor runs long and slow instead, which dries the air as it cools; the [dehumidification guide](https://roomwisedcminisplits.com/guide/mini-split-dehumidification/) explains why. The [window AC comparison](https://roomwisedcminisplits.com/guide/mini-split-vs-window-ac/) covers the same trade-off for window units.

## A new through-wall unit or a mini split?

If the building won’t allow an outdoor unit, a newer through-wall heat pump in the same sleeve is the simpler swap. If it will, a mini split is quieter, closes the opening and heats more efficiently.

### When another through-wall unit makes sense

- Your board or building owner won’t approve any outdoor equipment or new exterior lines
- The sleeve is sound and the louver is part of a uniform facade the building wants unchanged
- You plan to move soon and want the least disruption

### When a mini split is worth the extra work

- Noise in a bedroom or living room is the main complaint
- You heat with the PTAC’s strip for most of the winter
- The opening leaks air or water, and you want it closed properly
- A balcony, a rear wall or the roof can take an outdoor unit within the manufacturer’s line length

## What happens to the old sleeve

The sleeve stays in the wall; pulling it out means rebuilding brick and the facade around it. What changes is how it’s closed, and whether it becomes the path for the new lines.

### Closing it

An insulated panel fills the opening from inside, sealed at every edge against air and water. Outside, the louver stays in place or a matching blank replaces it. Keeping the louver means the facade looks the same, which helps when a board or a historic review is involved.

### Using it as the line route

The line set, drain and control cable pass through a panel fitted in the sleeve and on to a bracket or balcony unit outside. No new hole goes through the brick, and the visible change on the facade is a small line-hide cover leaving the louver.

> Check the bottom of the sleeve
>
> A rusted or back-sloped sleeve lets rain run into the wall instead of out. We look at it on the visit and plan the seal around what’s there, because a new panel on a failing sleeve still leaks.

## Wiring, heat and the drain

A PTAC plugs into its own receptacle, usually on a 208/230-volt circuit. A mini split’s outdoor unit is hard-wired through a disconnect, so the circuit gets checked against the new unit’s nameplate, not assumed.

- **The circuit.** If the existing wire and breaker match the outdoor unit’s requirements under NEC Article 440, the circuit can feed the new system. If the panel is full or the circuit is wrong, the plan says so. The [electrical guide](https://roomwisedcminisplits.com/guide/mini-split-electrical-requirements/) explains the options.
- **Heat on the coldest nights.** Washington averages about 10 nights a year below 20°F. For a room the PTAC heats alone, the plan says whether a mini split carries it through those nights or a backup is worth keeping; see [winter performance](https://roomwisedcminisplits.com/guide/do-mini-splits-work-in-winter/).
- **The drain.** A PTAC drains through its sleeve or throws water onto its own coil. A mini split head needs its own drain path: through the wall to the outside, into a building drain where the building allows, or to a condensate pump.

## What a PTAC replacement costs

A PTAC swap is a [single-zone install](https://roomwisedcminisplits.com/single-zone-mini-split-installation/) with extra work at the wall. Price follows our install ranges, moved by what happens to the sleeve and where the outdoor unit can go.

- Roomwise’s typical range for a standard single-zone install is $3,000 to $6,000, for one room with a short run to a balcony or bracket and a usable circuit.
- Roomwise’s typical range for a standard multi-zone install is $5,000 to $14,000, for replacing two to four through-wall units on one outdoor unit.
- Roomwise’s typical range for a complex single-zone job is $11,000 to $28,500, where the unit goes on the roof, the run crosses several floors, or building or historic review adds steps.

### What moves the price

- Closing the sleeve versus routing the lines through it
- A new louver or blank to match the facade
- Where the outdoor unit goes, and how it’s mounted
- Circuit work, or a panel with no room
- A condensate pump where the drain can’t fall outside

Your price comes from the site visit and arrives as a written estimate. The [cost estimator](https://roomwisedcminisplits.com/tools/mini-split-cost-estimator/) gives a first number, and the [operating cost guide](https://roomwisedcminisplits.com/guide/mini-split-operating-cost/) shows what the switch from strip heat can mean on a Pepco bill.

## Rebates for replacing a PTAC

Swapping a PTAC’s electric heat for a qualifying ductless heat pump falls under DCSEU’s electric-to-electric amount. The rebate needs the DOB permit we pull on every install, plus the equipment paperwork.

The current form pays $1,000 for ENERGY STAR certified equipment and $1,500 for ENERGY STAR Most Efficient. Where the system qualifies, the rebate can come off our invoice as an instant discount. Amounts and rules change during the program year, so check the [rebates guide](https://roomwisedcminisplits.com/guide/mini-split-rebates-dc/) first.

## In a condo or co-op building

In Navy Yard and downtown, about nine in ten homes sit in buildings of 20 or more units, and about three-quarters heat with electricity. Swapping one for a mini split changes the exterior, so the board has to agree.

The [condo installation page](https://roomwisedcminisplits.com/condo-mini-split-installation/) covers the board package, balcony and roof options, and older buildings without separate electric meters. If you have three or more wall units, a [multi-zone system](https://roomwisedcminisplits.com/multi-zone-mini-split-installation/) can replace them from one outdoor unit, which gives the board one outdoor unit to review instead of three.

## What's included

- A look at the sleeve, its exterior louver, and the circuit and receptacle feeding the PTAC
- A heat-load calculation for the room the PTAC serves now
- A written plan with the head spot, line route, outdoor unit, drain path, what happens to the sleeve, and the price
- Taking the PTAC out of its sleeve
- Closing the sleeve with an insulated, weather-sealed panel, or using it as the line route
- The DC mechanical permit
- Pressure test and deep vacuum before the refrigerant is released
- Startup, a walkthrough of the remote, and the paperwork for your records

## Keep the PTAC, fit a newer through-wall heat pump, or switch to a mini split

|  | Existing PTAC with heat strip | New through-wall heat pump in the same sleeve | Mini split |
| --- | --- | --- | --- |
| How it heats | Electric resistance strip | Heat pump, with a strip for the coldest days | Heat pump |
| Where the compressor runs | In the wall, beside you | In the wall, beside you | Outside |
| The wall opening | Gaps around the chassis | Same opening, new gaskets | Closed and insulated, or a line route |
| Exterior change | None | None, if the louver matches | Line set and outdoor unit |
| Building approval | None to keep it | Depends on the building | Needed for the outdoor unit and route |

## Related resources

- [Decision Guide**Should I replace my window AC units with a mini split?** What you gain and give up when the window units come out, when keeping one still makes sense, and what the switch involves in a DC house.](https://roomwisedcminisplits.com/guide/mini-split-vs-window-ac/)
- [Learn**What electrical work does a mini split need?** The circuit, the breaker, the disconnect and the panel, explained for older DC houses where the panel is often the tightest part of the plan.](https://roomwisedcminisplits.com/guide/mini-split-electrical-requirements/)
- [Learn**Do mini splits work in winter?** What happens inside a heat pump on a 25-degree DC morning, how to read a unit's cold-weather numbers, and how to plan for the handful of nights that test it.](https://roomwisedcminisplits.com/guide/do-mini-splits-work-in-winter/)
- [Cost Guide**How much does it cost to run a mini split?** The arithmetic behind a mini split's electric bill in Washington, with Pepco's current residential rates and the efficiency ratings that matter.](https://roomwisedcminisplits.com/guide/mini-split-operating-cost/)
- [Cost Guide**What rebates can I get for a mini split in Washington, DC?** The DCSEU heat pump rebate explained in plain terms, from the efficiency tier and the heat you're replacing to the permit, the paperwork and the date it has to be in.](https://roomwisedcminisplits.com/guide/mini-split-rebates-dc/)

## How a job runs

### First call

You tell us which rooms, when they're uncomfortable, and what heats and cools the house now.

### Home visit

We measure the rooms, check your panel, and look at the walls for line routes and a spot for the outdoor unit.

### Written plan

Head locations, the line route, the drain plan and a price, in writing.

### Install and startup

Mount, route, pressure-test, vacuum, start each head and walk you through the controls.

## PTAC replacement: questions

### What happens to the wall sleeve when the PTAC comes out?

It stays in the wall, since pulling it means rebuilding masonry. It can be closed with an insulated, sealed panel inside and the louver kept or blanked outside, or used as the path for the new line set so no new hole goes through the facade. The plan names which.

### Is a mini split cheaper to run than a PTAC with an electric heat strip?

For heating, in most winter hours, yes. A resistance strip turns each kilowatt-hour into one kilowatt-hour of heat; a heat pump moves heat and delivers more than that at most DC temperatures. The savings depend on the unit, the room and your Pepco bill.

### Can the PTAC's circuit be reused for a mini split?

Sometimes. A PTAC usually sits on its own 208/230-volt circuit, and if the wire size and breaker match the new outdoor unit's nameplate, that circuit can feed it. The receptacle becomes a hard-wired disconnect. If they don't match, the plan says what changes.

### Should I replace my PTAC with another PTAC or with a mini split?

If the building won't allow an outdoor unit, a newer through-wall heat pump in the same sleeve is the simpler swap. If it will, a mini split is quieter, closes the drafty opening and heats more efficiently. We price the mini split path on the visit.

### How long does a PTAC to mini split swap take?

Once approval and the DC permit are in hand, one room takes about a day, including closing the sleeve. In a condo or co-op, board approval for the outdoor unit comes first and sets most of the calendar.

## Related services

- [Service**Condo installation** A mini split planned around your board's rules, from the approval package to startup.](https://roomwisedcminisplits.com/condo-mini-split-installation/)
- [Service**Single-zone installation** One outdoor unit, one indoor head, one room that finally holds its temperature.](https://roomwisedcminisplits.com/single-zone-mini-split-installation/)
- [Service**Multi-zone installation** One outdoor unit, two to five heads, and every room set to its own temperature.](https://roomwisedcminisplits.com/multi-zone-mini-split-installation/)

## Get an estimate for ptac replacement

Tell us which rooms aren't working and where the house is. We'll set up a home visit and put the plan in writing.

(771) 213-3105