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Verify that you have the
correct thermostat
Using the compatibility chart
below, verify that you purchased
the correct CT87Thermostat 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 Care 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 Ye s
Electric heat furnace with or without cooling: No No Ye s
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
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