Noticed something odd today. Heard the heat come on as it still in the 50s here in the People's Republic of NY. Normally I wouldn't have thought much of this, but was surprised when I realized I heard the oil furnace on, as the heat pump normally works above 32 or so. Stuck my head outside & to my amazement heard the outside compressor on as well.
Any thoughts as to what to check for? I have a Honeywell bulb thermostat outside that is used to control the changeover temp from heatpump to oil, which is what I first suspect.
Any thoughts? ideas?
Thanks to all in advance.