Do I need a professional to install the Keystone 8,000 BTU Through-the-Wall Air Conditioner - Cool Only?

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.

Through-the-wall unit

Keystone

8,000 BTU Through-the-Wall Air Conditioner - Cool Only

Name: Keystone 8,000 BTU Through-the-Wall Air Conditioner - Cool Only
Brand: Keystone

A through-the-wall air conditioner rated at 8,000 BTU. It installs in a wall sleeve.

$530

List price

No live retailer for this exact model right now.

Last listed at Sylvane for $529.99 on Jul 9, 2026. We have not been able to confirm it since.

The closest through-the-wall unit you can buy today:

Frigidaire 8,000 BTU Through-the-Wall Air Conditioner with Heat 115V

Performance

Cooling capacity: 8,000 BTU · 2.3 kW
Heating capacity: Cooling only
Room coverage: Not published
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Indoor noise: 45 dB(A)about as loud as a refrigerator
Outdoor noise: Not published
Indoor unit

Will it fit your wall sleeve?

Keystone's installation manual lists the existing sleeves it fits, from Frigidaire, GE/Hotpoint, Whirlpool, Fedders/Emerson, Sears/Kenmore, Carrier and Friedrich (25½ to 27 inches wide), and the old rear grille is replaced by the one in the kit. Keystone's own sleeve for a new installation is the KSTSLV1, sold as a 26-inch sleeve (its spec sheet gives 25½ x 15¼ x 17½ in.), for walls up to 17¾ inches thick. Source: Keystone installation manual

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

What is good

At 45 dB(A) it is quieter than 24 of the 24 other through-the-wall units we list that publish a noise figure.

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

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

General

Common questions about the Keystone 8,000 BTU Through-the-Wall Air Conditioner - Cool Only

How loud is the Keystone 8,000 BTU Through-the-Wall Air Conditioner - Cool Only?: 45 dB(A) indoors, about as loud as a refrigerator.
Do I need a professional to install the Keystone 8,000 BTU Through-the-Wall Air Conditioner - Cool Only?: 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.