I have two 13 year old Lennox G26 propane fueled furnaces (attic and basement). The one in the basement is a high efficiency unit with external air intake. At night, I keep the temperature at 59. In the morning, the thermostat is set for 67. Both furnaces come on when the thermostat calls for heat and take the temperature to about 64-65 both downstairs and upstairs before the thermostat shuts off (not calling for heat). After about 1-2 minutes, the thermostat calls for heat and both furnaces start again and then reach the 67 set point. There are no problem codes showing on the furnaces when they first shut down (LED shows normal operation) so I don't think this is a high limit switch issue. Is this unusual or indicating a problem with the Honeywell Programmable Thermostat anticipator or just normal operation? There are no problems during the day to keep the set temperature. This is not a new problem with the furnaces and they have been serviced. Thanks for your help.
Further reading on the 'Net indicates that programmable, electronic thermostats only have so called automatic anticipators that are not adjustable and that the thermostat/furnace cycling is normal under the circumstances I described. On/off cycle times can be adjusted but I don't think anything needs to be done as these were presumably factory set at time of installation. So I will assume for now that this is how the thermostats/furnaces are supposed to function for HEAT. Other more professional opinions are welcome.
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