Is this a 2 wire hook up?

This is for 2 wire 24VAC systems. It is NOT for millivolt systems, which are also 2 wire but work off typically 750 millivolt DC generated by a thermocouple constantly heated by the pilot light. The user manual states it is for 24 VAC systems. Honetwell customer support confirms it does not work with millivolt systems.

Is there a battery in ct87k

What battery does it take? CR2050?

How do you turn it off during the summer time?

1) Turn dial to its CCW-min. Unless you a/c your place to ~45º F, that's pretty-much OFF. (And you'd be a 'Climate criminal'?) via a/c silliness. 2) Just pull the unit out of its socket ... the way you installed it originally; it's just two wires behind. The thermostat merely Shorts-these for 'ON'. HTH.

Will this thermostat work okay for replacing my King thermostat--line voltage double pole?

search for "line voltage thermostat" in tools and home improvement, there are several to choose from. For example "Honeywell Manual 4 Wire Premium Baseboard/Line Volt Thermostat(YCT410B1000/U)"

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Honeywell Home CT87K1004 The Round Heat Only Manual Thermostat,Large,White,Large

Product ID: 6251331

Details

Brand
Honeywell Home
Controller Type
Ring
Model Name
CT87K1004
Product Dimensions
2.88"D x x
Special Feature
Fan Control

🎯±1°F precise control

🔧Easy manual dial

🕰️Classic round design

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Description

🕰️ Keep it classic, keep it cool — comfort made simple.

MERCURY FREE SAFE - Eco-conscious choice with no mercury, aligning with modern sustainability values.
TIMELESS ROUND DESIGN - Iconic style that complements any space with a sleek, familiar look.
CLEAN AESTHETIC FINISH - Decorative cover ring hides wall imperfections for a polished, professional look.
EFFORTLESS MANUAL OPERATION - Twist the dial and take charge—intuitive control without the tech hassle.
PRECISION TEMPERATURE CONTROL - Maintain your perfect comfort zone with ±1°F accuracy—no guesswork needed.

The Honeywell Home CT87K1004 Round Heat Only Manual Thermostat combines iconic circular styling with precise ±1°F temperature control. Designed for easy manual dial operation, it fits seamlessly into any environment while hiding wall marks with its decorative cover ring. Mercury-free and reliable, this thermostat is a trusted choice installed in over 70 million homes, delivering straightforward, efficient heating control without the complexity of programming.

Specifications

ASIN	B000EANORW
Additional Features	Fan Control
Best Sellers Rank	#16,591 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #9 in Home Nonprogrammable Thermostats
Brand Name	Honeywell Home
Color	White
Control Method	App
Control Type	Dial Control
Controller Type	Ring
Customer Reviews	4.1 4.1 out of 5 stars (2,970)
Display Type	Manual
Global Trade Identification Number	00085267263672
Included Components	Honeywell CT87K The RoundHeat Only Manual Thermostat
Item Dimensions D x W x H	2.88"D x 3.62"W x 3.62"H
Item Type Name	Round Heat Only Manual Thermostat, White, 1-Pack
Item Weight	3.2 ounces
Manufacturer	Honeywell Home
Manufacturer Part Number	YCT87K1003/U
Manufacturer Warranty Description	1 year limited warranty.
Model Name	CT87K1004
Model Number	CT87K1004
Mounting Type	Round Non-Programmable Thermostat Owner's Guide Model: CT8775A,C French
Number of Items	1
Power Source	Corded Electric
Product Style	Thermostat Round
Shape	Round
Specific Uses For Product	Air Conditioner
Temperature Control Type	Manual
UPC	085267263672
Unit Count	1 Count
Voltage	120 volts

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$63.91

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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