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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Description

🌡️ Classic comfort, precision control—your home’s timeless thermostat upgrade!

ECO FRIENDLY SAFE - Mercury-free construction ensures a healthier home environment.
PRECISION AT YOUR FINGERTIPS - Adjust temperature with ±1°F accuracy for ultimate comfort control.
EFFORTLESS INSTALLATION USE - Simple twist dial means no complicated setup—comfort made easy.
TRUSTED BY MILLIONS WORLDWIDE - Join over 70 million homes enjoying reliable Honeywell performance.
TIMELESS DESIGN MODERN APPEAL - Iconic round dial fits seamlessly in any space, blending style with function.

The Honeywell Home CT87K1004 Round Heat Only Manual Thermostat combines iconic design with precise ±1°F temperature control. Battery powered and mercury free, it offers easy installation and reliable performance trusted by over 70 million users globally. Its large, white round dial and decorative cover ring ensure a clean, stylish look that fits any environment.

Specifications

Brand	Honeywell Home
Product Dimensions	2.88"D x 3.62"W x 3.62"H
Controller Type	Ring
Special Feature	Fan Control
Color	White
Specific Uses For Product	Air Conditioner
Temperature Control Type	Manual
Included Components	Honeywell CT87K The RoundHeat Only Manual Thermostat
Power Source	Battery Powered
Item Weight	3.2 ounces
Voltage	120 Volts
Shape	Round
Display Type	Manual
Control Type	Dial Control
Mounting Type	Round Non-Programmable Thermostat Owner's Guide Model: CT8775A,C French
Style	Thermostat Round
Backlight	No
UPC	085267263672
Global Trade Identification Number	00085267263672
Manufacturer	Honeywell Home
Part Number	YCT87K1003/U
Item model number	CT87K1004
Is Discontinued By Manufacturer	No
Size	Large
Item Package Quantity	1
Type of Bulb	LED
Special Features	Fan Control
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 year limited warranty.

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