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

🌡️ Stay cool, stay classic — control your comfort with style!

ECO CONSCIOUS SAFE - Mercury-free design keeps your space safe and environmentally friendly.
PRECISION AT YOUR FINGERTIPS - Experience exact temperature control with ±1°F accuracy for ultimate comfort.
TIMELESS DESIGN MODERN APPEAL - Classic round styling blends seamlessly into any professional or home environment.
CLEAN AESTHETIC NO WALL WORRIES - Decorative cover ring cleverly hides unsightly wall marks for a polished look.
EFFORTLESS CONTROL ZERO COMPLEXITY - Manual dial control ensures straightforward, no-fuss temperature adjustments.

The Honeywell CT87K1004 is a large, round, manual heat-only thermostat featuring precise ±1°F temperature control, a classic design with a decorative cover ring to hide wall marks, and easy installation. Mercury-free and battery-powered, it offers reliable, straightforward temperature management with a fan control feature, perfect for professional and home settings.

Specifications

Brand	Honeywell
Model Name	CT87K1004
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	0.2 Pounds
Voltage	120 Volts
Material	solid
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 Weight	3.2 ounces
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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