What size room does the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat cool?

It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).

Do I need a professional to install the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat?

Not to replace a unit, but usually yes for a new opening. Sliding it into an existing wall sleeve it fits is a job you can do yourself (it is heavy, so plan on two people), with no refrigerant work. A new installation means cutting an opening through an exterior wall and fitting a sleeve, which is contractor work and usually needs a building permit.

Does the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat heat as well as cool?

Yes. It also heats, rated 11,600 BTU of heating output.

Through-the-wall unit Heats too

TCL · Model H12T9XH

12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat

A through-the-wall air conditioner rated at 12,000 BTU for rooms up to 550 sq ft. It heats in winter too and installs in a wall sleeve.

$649.99

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Will it cool your room?

Room size (assumed)550 sq ft ≈ 51.1 m²

Fits a 51.1 m² room

This unit's cooling matches a 550 sq ft room. Set your room size to check the fit for your space.

At a glance

Best for replacing a through-the-wall unit in an existing wall sleeve.

Cooling

3.5 kW

Size

Average

Noise

Install: Slides into a wall sleevePermission: A new wall opening usually needs a permit

Performance

Cooling capacity: 12,000 BTU · 3.5 kW
Heating capacity: 11,600 BTU
Room coverage: up to 550 sq ft
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Model number: H12T9XH
Indoor noise: Not published
Outdoor noise: Not published
Indoor unit: 24.21 x 14.53 x 20.28 in
Outdoor unit: None
Refrigerant: R-32
Wi-Fi / app: Not published
Outdoor unit needed: No
Wall sleeve: Needs a sleeve at least 26 x 15¾ in.
Warranty: 1-Year Parts and Labor Limited Warranty

Will it fit your wall sleeve?

TCL says its through-the-wall units fit standard 26-inch sleeves: its manual asks for a sleeve (not supplied by TCL) at least 26 inches wide and about 15¾ inches high, and TCL strongly recommends insulating the gap if the sleeve is slightly larger. A sleeve shallower than 20 inches still works, but the unit then sits further out into the room. Source: TCL: choosing a wall sleeve

Every through-the-wall AC and PTAC by the sleeve it fits

Installation & the rules that apply

This is a through-the-wall air conditioner. It sits in a sleeve built into an exterior wall, so the window-unit mounting and bracket rules do not apply to it. Swapping it into an existing sleeve is a like-for-like replacement; cutting a new opening changes the building's exterior wall, which usually needs a building permit and, in a condo, co-op or historic building, approval first.

Installation

Slides into a wall sleeve

Refrigerant

R-32

GeneralRenters: get written landlord consent firstReviewed June 2026Often blocks install

GeneralCondo / HOA: exterior changes need approvalReviewed June 2026Permit required

GeneralHistoric / listed buildings: consent before any exterior unitReviewed June 2026Permit required

MassachusettsMassachusetts: local historic district approval (MGL c.40C)Reviewed June 2026Permit required

United StatesUS: local mechanical and electrical permits (vary by city)Reviewed June 2026Permit required

See full rules by region

Common questions about the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat

What size room does the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat cool?: It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).
Do I need a professional to install the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat?: Not to replace a unit, but usually yes for a new opening. Sliding it into an existing wall sleeve it fits is a job you can do yourself (it is heavy, so plan on two people), with no refrigerant work. A new installation means cutting an opening through an exterior wall and fitting a sleeve, which is contractor work and usually needs a building permit.
Does the TCL 12,000 BTU Through-the-Wall Air Conditioner - Cool/Heat heat as well as cool?: Yes. It also heats, rated 11,600 BTU of heating output.