The cooling worked before. Why is there no warmth now?
Cooling that worked before does not prove the heat works now. First find out which equipment supplies heat and what happens when the control requests it. The indoor cabinet may not be a gas furnace. Do not order an ignition part based only on what you call the system.
Identify the system with its covers closed
Use an old invoice, manual or outside label you can see safely. Say if you do not know whether the home has a furnace or heat pump. The system type needs to be checked before choosing how to find the fault.
Note the normal screen, heat target and whether air moves at room vents. Say if warmth is missing throughout the cycle or only at startup. Heat pumps and furnaces can behave differently. That does not mean an unexplained fault should be ignored.
Find records before reaching for a label
If you just moved into an East or South Naples home, ask the owner for service records. Do not climb into an attic or move heavy items to read a label. Leave cabinet panels closed. It is fine to report the model as unknown.
Say if the indoor and outdoor units need separate access. Name the room thermostat you used. Mention any other system that may serve the space. Two visible units do not prove they are a matched pair.
Confirm what the repair would restore
Ask which unit provides heat and what test found the fault. Would the proposed work restore that heating function? If a new system is suggested, ask why. Get a separate scope for it. Fault checks, choosing equipment and permit review are distinct steps. Before booking, check service coverage for the address and the actual system.