Soleus Air WS4-08EW-301 Saddle
Window unit

Soleus Air

WS4-08EW-301 Saddle

8,000 BTU Soleus Air saddle window AC (EER 12.0) with a tool-free over-the-sill install and WiFi voice control for rooms up to 350 sq ft, a fixed-speed alternative to inverter U-shaped units.

$610

List price

Sylvane sale price $609.99 (regular $689.99).

No live retailer for this exact model right now.

The closest window unit you can buy today:

Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With HeatKeystone 8,000 BTU 115V Energy Star Window Air Conditioner - With HeatCovers up to 350 sq ft · quiet at 43 dB In stock$599.99View

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Will it cool your room?

Room size (assumed)350 sq ft ≈ 32.5 m²
Fits a 350 sq ft room

This unit's cooling matches a 350 sq ft room. Set your room size to check the fit for your space.

Every window air conditioner side by side

At a glance

Best for open-window saddle cooling on a non-inverter budget.

Cooling
8,000 BTU
Size
Average
Noise
49 dB
Audible
Install: Self-fit, no pro neededPermission: Usually no permit

Performance

Cooling capacity
8,000 BTU · 2.3 kW
Heating capacity
Cooling only
Room coverage
up to 350 sq ft
Energy Star
No
CEER
Not published
Annual energy (cooling)
Not published

Noise, size & features

Model number
WS4-08EW-301
Indoor noise
49 dB(A)about as loud as a refrigerator
Outdoor noise
Not published
Indoor unit
18.7 x 15 x 28.9 in
Outdoor unit
None
Refrigerant
R-32
Wi-Fi / app
Yes
Outdoor unit needed
No

What is good

  • U-shaped saddle design that lets the window stay usable
  • Tool-free slide-over-sill installation
  • WiFi with voice control and a MyTemp remote sensor
  • R-32 refrigerant, EER 12.0, removes up to 34 pints/day

What to watch

  • Fixed-speed (not inverter), so less efficient than inverter saddles
  • Not Energy Star certified, and no published CEER
  • 49 dB at high fan, louder than inverter U-shaped units

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
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 Soleus Air WS4-08EW-301 Saddle

How loud is the Soleus Air WS4-08EW-301 Saddle?
49 dB(A) indoors, about as loud as a refrigerator.
What size room does the Soleus Air WS4-08EW-301 Saddle 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 Soleus Air WS4-08EW-301 Saddle?
No. It is a window unit you can fit yourself, no professional needed. Usually no permit.

Is a window even the right type?

Compare windows against the other types on price, noise, efficiency and install.

Buying guides for a window unit like this

The questions buyers ask, answered from live prices and real specs. See where a window unit like this fits.