Name: Keystone Supplemental Heat Capability Medium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )
Brand: Keystone
SKU: 5015305819
Price: 429.99 USD
Availability: InStock
Rating: 3.9 (72 reviews)

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At Keystone, we prioritize your family's comfort. Our budget-friendly heat/cool 115V window air conditioner is designed to meet your needs. This versatile AC unit not only provides efficient cooling but also offers supplemental heat capability. It serves as an additional heat source when outdoor temperatures rise above 23 degrees Fahrenheit, complementing your main heat source. Please note that this mode is meant to supplement, not replace, your primary heat source. You'll find plenty of money-saving features in this multi-seasonal unit. Take advantage of the energy saver mode, sleep mode, and programmable 24-hour timer to customize your cooling and heating preferences according to your schedule. Additionally, our Follow Me LCD remote control ensures total convenience, allowing everyone to relax in blissful comfort.

8,000 BTU cooling capacity / 3,500 BTU supplemental heating capacity
Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 23°F
Heating mode is supplemental and NOT meant as primary heat source
Designed for a room up to 350 sq ft with dehumidifer capable of removing up to 1.9 pints per hour
Indoor Noise Level dBA (Hi/Med/Lo): 60/56.5/55
Electronic controls with LED display allows you to easily select options with the touch of a button
Temperature sensing LCD remote control allows you control the temperature from across the room
Auto-restart saves your settings for when power is restored to the unit
Window ac unit is backed by a 1 year limited warranty for peace of mind

General
Sub-Brand	N/A	Series Name	Supplemental Heat Capability
Plug Style	LCDI	Color/Finish Family	White
Filter Type	Mesh	Manufacturer Color/Finish	White
Control Type	Electronic	Plug Type	5-15P

Dimensions
Window Opening Maximum Height (Inches)	16.5	Height (Inches)	14.65
Window Opening Maximum Width (Inches)	36	Weight (lbs.)	60.63
Window Opening Minimum Height (Inches)	16.5	Width (Inches)	18.98
Window Opening Minimum Width (Inches)	26.8	Cord Length (Feet)	7
Suggested Room Size	300-500 sq ft	Maximum Coverage Area (Sq. Feet)	350
Depth (Inches)	21.46

Features
Inverter	No	Cooling BTU Rating (BTU)	8000
Hub Required	No	Fan Only Option	Yes
Decibel Rating (Lowest Setting)	55	Heating BTU Rating (BTU)	3500
Decibel Rating (Highest Setting)	60	Low Voltage Compensation	No
Window Venting Kit Included	Yes	Multi-Directional Air Control	Yes
Quiet Mode	No	Sleep Mode	Yes
Noise Rating	Standard (41 decibels or above)	Washable Filter	Yes
Dehumidifier Included	Yes	Oscillation	No
Number of Speeds	3	Remote Control Included	Yes
Timer Included	Yes	Thermostat	Yes
Voltage (Volts)	115	Heater Included	Yes
Overload Protection	No	Lowe's Exclusive	No
Auto Cool	Yes	Voice Controlled	No
Automatic Shut-Off	Yes

Compatibility
Works with Apple HomeKit	No	Wi-Fi Compatibility	No
Works with SmartThings	No	Works with the Google Assistant	No
Works with Amazon Alexa	No	Bluetooth Compatibility	No
Works with iOS	No	Smart Compatible	No
Works with Android	No	Works with Sonos	No

Warranty
Warranty	1-year limited

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -	Safety Listing	UL safety listing
ENERGY STAR Certified	No	ADA Compliant	No
Combined Energy Efficiency Ratio (CEER)	0

Miscellaneous
UNSPSC	40101700

Check out the Best Selling Window Air Conditioners on Lowes.com

Review

3.9 out of 5

72 Reviews

57% Recommend this product

Ratings may include incentivized customer reviews.

+ 14

What Customers Are Saying

Customers overwhelmingly praise the unit's powerful cooling performance and quiet operation, with many noting it rapidly cools small to medium rooms and runs so quietly guests ask where it came from. The adjustable window kit and remote control with programmable timer are frequently highlighted as convenient features. However, a substantial number report the heating function is weak or ineffective, with several describing it as barely functional for supplemental warmth. Despite heating disappointments, most customers find the cooling capability and ease of installation worthwhile.

Customer review summary generated by AI, including incentivized reviews.

72 Customer Reviews

Sort By

a/c and heater

Would Not Recommend

garbage

koaAugust 23, 2026

Was this Review Helpful ?

Response from Product Expert

Hello,

Thank you for taking the time to share your feedback. We're sorry to hear that your experience did not meet your expectations....

Product ExpertAugust 23, 2026

Works Great

Would Recommend

In use now for 20 months in the Tampa Bay Area. I would purchase again

LivingBigInJesusMay 13, 2026
From Supplemental Heat Capability Large Room Window Air Conditioner with Heater, Remote Included ( 230-Volt , 12000-BTU ) Verified Purchaser

Was this Review Helpful ?

Response from Product Expert

Thank you for your positive feedback. We are pleased to hear that it met your expectations.

Product ExpertMay 14, 2026

Provides heat and air

Would Recommend

So far working well in my area

Realtor47May 11, 2026
Verified Purchaser

Was this Review Helpful ?

Response from Product Expert

Thank you for your positive feedback. We are pleased to hear that it met your expectations.

Product ExpertMay 12, 2026

Sooooo helpful!!

[This review was collected as part of a promotion.] This AC unit was such a gift to us trying to cool a small upstairs room in the summertime! Note: the plug doesn’t fit a standard outlet so you do need to make sure you have the correct outlet for this machine to function

LauraGApril 16, 2026

From Sampling program

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86YWxtbw/9f116361-73ea-51dd-8c8f-cff160450aaf

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86YWxtbw/ad3b4da8-7c7d-5fa6-9be3-c519ee50a385

Heat and air all in one

[This review was collected as part of a promotion.] I have sent in a ticket for this because I haven't had anyone available to install it. I didn't notice how hard it would be getting this window off to put it on and I need help and so I'm trying to get someone over to help but haven't been able to yet. I know these work well because I had one similar to this back years ago.

CherylHApril 16, 2026

From Sampling program

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86YWxtbw/8bdd32fe-76a8-5ba0-81d2-b2c036db0345

17 Questions

Read All Q&A

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The AC works amazing but when the temps went down and we turned on the heat, it didn’t work. It feels like a fan is on even under the heat setting.

RO for wall install

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COMPARE PRODUCTS

		Name	Current Item KeystoneSupplemental Heat Capability Medium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )
		Ratings	72
		Voltage (Volts)	115
		Remote Control Included
		Cooling BTU Rating (BTU)	8000
ROVSUNWindow Air Conditioner with 12000 Cooling BTU and 11000 Heat BTU for Bedroom Dorm up to 550 Sq Ft 230V White/ Wall AC Unit with APP and Voice Smart Control Timer Function and Easy Installation Kit Work with Alexa and Google Assistant	GEMedium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )	GEClearView Medium Room Window Air Conditioner , Remote Included ( 115-Volt , 8300-BTU )	WhirlpoolSupplemental Heat Capability Medium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )	FrigidaireMedium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )	WhirlpoolSupplemental Heat Capability Large Room Window Air Conditioner with Heater, Remote Included ( 230-Volt , 12000-BTU )	KeystoneInverter with Supplemental Heat Medium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 8000-BTU )	GELarge Room Window Air Conditioner with Heater, Remote Included ( 240-Volt , 12200-BTU )	LGSupplemental Heat Capability Medium Room Window Air Conditioner with Heater, Remote Included ( 115-Volt , 7600-BTU )
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