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Verify that you have the
right thermostat
Using the compatibility chart
below, verify that you purchased
the right CT87 thermostat for
your heating/cooling system. If
you are unsure which model is
right for your system, visit
www.honeywell.com/
yourhome or call Honeywell
Customer Relations at
1-800-468-1502.
* CT87A is compatible with 2-wire cooling-only systems.
Heating/Cooling system
Compatible with:
CT87A CT87B CT87J
Heating only: Gas or oil fueled warm air, steam, or hot
water heat
YES YES No
Cooling only: Electric air conditioning YES* YES YES
Heating and cooling: Gas or oil fueled warm air,
steam, or hot water heat with electric air conditioning
No
YES No
Single stage heat pump: Outdoor heating/cooling unit
(compressor) with no auxiliary or backup heat.
No No
YES
Electric heat furnace with or without cooling: No No
YES
Electric baseboard: Electric heating strips located just
above the floor, usually 120–240 volts
No No No
Multistage: A conventional system with more than one
stage, or an outdoor heating/cooling unit (compressor)
with auxiliary or backup heat.
No No No
CT87A,B,J Round
®
Thermostat
LOW VOLTAGE (15 TO 30 VAC),
THERMOSTAT AND MOUNTING HARDWARE
Installation Instructions
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