Thermostat Heat Works Not Cool: What to Record
If you smell gas or a CO alarm sounds, leave the home and call the gas utility or 911 from outside.
Heating that works while cooling does not can involve thermostat settings, wiring, or cooling equipment. Successful heating does not establish that the cooling side is healthy. Confirm COOL mode and a setpoint below the room reading, record which units respond, and request a diagnosis if cooling remains unavailable after those basic checks.
Talk to a contractor about your thermostat that heats but will not cool
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
HVAC Responder Editorial Team · Reviewed 2026-11-01 · Facts quoted from manufacturer documentation
What the source supports
According to Can a Bad Thermostat Have Heat But Not Cool - Trane:
If the thermostat is set to cool but the AC is not turning on, the thermostat may be to blame.
Discuss your thermostat that heats but will not cool with a contractor
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Safe observations before the service call
Do not move thermostat wires to test the cooling circuit. Compare the display response in each mode and note whether the indoor blower operates.
Details to give the contractor
Tell the contractor that heating works and identify what happens only in cooling mode. Include any recent thermostat installation so compatibility and configuration can be assessed.
Related symptoms and code references
- Thermostat Blank: Battery or System Power?
- Thermostat Says Heat On but Furnace Is Not Running
- Thermostat Blinking Cool On: Delay or Cooling Fault?
- Carrier furnace codes
- Goodman furnace codes
- Lennox furnace codes
- Rheem furnace codes
- Trane furnace codes
- York furnace codes
- Furnace cold-air guide
- All HVAC problem pages
What happens when you call about your thermostat that heats but will not cool
- Your call routes to an independent local contractor registered for your ZIP code.
- Ask the fee and the arrival window.
- The decision to hire stays with you.
One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Sources and review date
- Can a Bad Thermostat Have Heat But Not Cool - Trane · Read 2026-11-01