How loud is the Keystone 8,000 BTU Window Air Conditioner?

56 dB(A) indoors, about as loud as a dishwasher.

What size room does the Keystone 8,000 BTU Window Air Conditioner cool?

It is rated to cool a room up to 350 sq ft (8,000 BTU · 2.3 kW).

Do I need a professional to install the Keystone 8,000 BTU Window Air Conditioner?

No. It is a window unit you can fit yourself, no professional needed. Usually no permit.

Window unit

Keystone · Model KSTAW08DE

8,000 BTU Window Air Conditioner

Name: Keystone 8,000 BTU Window Air Conditioner
Brand: Keystone
Price: 279.99 USD
Availability: InStock

A window air conditioner rated at 8,000 BTU for rooms up to 350 sq ft. It self-installs in a window.

$279.99

Live price at Sylvane

Price checked Sep 30, 2026

Buy at Sylvane In stock

Performance

Cooling capacity: 8,000 BTU · 2.3 kW
Heating capacity: Cooling only
Room coverage: up to 350 sq ft
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Model number: KSTAW08DE
Indoor noise: 56 dB(A)about as loud as a dishwasher
Outdoor noise: Not published

Warranty and refrigerant are from Sylvane's published specifications for this exact configuration, checked Sep 26, 2026.

What is good

At $280 it undercuts 18 of the 20 other 8,000-9,000 BTU window units we list with a live price.
Uses R-32 (GWP 675), the low-GWP class new US residential equipment moved to.

What to watch

At 56 dB(A) it is louder than 61 of the 81 other window units we list that publish a noise figure.

Installation & the rules that apply

This is a window unit. No EPA Section 608 technician is needed: the refrigerant circuit is factory-sealed and never opened. A plug-in window unit needs no permit, so the friction is with your building rather than the government. Many HOAs restrict window units on appearance grounds, though an HOA regulating how you mount one stands on much firmer ground than one banning cooling outright. Landlords can set conditions, and the falling hazard is taken seriously: New York City, for instance, requires window units to be supported by brackets or mounting rails, and many building insurers and HOAs now require a bracket regardless of city.

Installation

Self-fit, no pro needed

Refrigerant

R-32

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

Common questions about the Keystone 8,000 BTU Window Air Conditioner

How loud is the Keystone 8,000 BTU Window Air Conditioner?: 56 dB(A) indoors, about as loud as a dishwasher.
What size room does the Keystone 8,000 BTU Window Air Conditioner cool?: It is rated to cool a room up to 350 sq ft (8,000 BTU · 2.3 kW).
Do I need a professional to install the Keystone 8,000 BTU Window Air Conditioner?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.