downeaster, thanks for the information and suggestion - although I grew up in Florida, all of my adult life - so far - has been in New Jersey, where for the past 27 years, in our 1880 farmhouse, the oil furnace provides heat and a window air conditioner provides cool. Your simplified explanation remined me that many new homes now probably use a single unit for both heating and cooling.
The exicitement/terror of buying a home and moving has muddled my brain.
Your advice to hire a reputable HVAC tech to inspect the system was exactly on target.
Thanks again
Krys
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