Do I need a professional to install the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat?

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

Window unitENERGY STAR Heats too

Keystone · Model KSTAW08INV-HC

8,000 BTU 115V Energy Star Window Air Conditioner - With Heat

Name: Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat
Brand: Keystone
Price: 599.99 USD
Availability: InStock

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

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Running costest.

~$75/year

Estimated from ENERGY STAR's published annual energy use at about 750 hours of cooling a year (the DOE test standard) and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). A standardized figure for comparison; your real cost depends on how much you run it, your local rate and your climate.

Local rates vary widely (about 15¢/kWh in Florida to 33¢ in California), and hotter regions run their AC more hours, so your real cost differs.

Performance

Cooling capacity: 8,000 BTU · 2.3 kW
Heating capacity: 7,000 BTU
Room coverage: up to 350 sq ft
Energy Star: Yes
CEER: 14.5
Annual energy (cooling): 414 kWh

Noise, size & features

Model number: KSTAW08INV-HC
Indoor noise: 43 dB(A)about as loud as a quiet library
Outdoor noise: Not published
Indoor unit: Not published
Outdoor unit: None
Refrigerant: R-32
Wi-Fi / app: Not published
Outdoor unit needed: No
Warranty: 1-Year Limited Warranty

What is good

At 43 dB(A) it is quieter than 66 of the 81 other window units we list that publish a noise figure.
Heats as well as cools, which 31 of the 157 window units we list offer.
Uses R-32 (GWP 675), the low-GWP class new US residential equipment moved to.

What to watch

Its CEER 14.5 is less efficient than 36 of the 47 other window units we list with a published CEER.
At $600 it costs more than 20 of the 20 other 8,000-9,000 BTU window units we list with a live price.

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 Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat

How much does the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat cost to run per year?: About $75 a year. Estimated from ENERGY STAR's published annual energy use at about 750 hours of cooling a year (the DOE test standard) and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). A standardized figure for comparison; your real cost depends on how much you run it, your local rate and your climate.
How loud is the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat?: 43 dB(A) indoors, about as loud as a quiet library.
How energy-efficient is the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat?: Its efficiency rating is CEER 14.5, and it is ENERGY STAR certified.
What size room does the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat 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 115V Energy Star Window Air Conditioner - With Heat?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.
Does the Keystone 8,000 BTU 115V Energy Star Window Air Conditioner - With Heat heat as well as cool?: Yes. It also heats, rated 7,000 BTU of heating output.