TL;DR
Temperature split is the difference between return-air and supply-air temperature measured across a furnace heat exchanger or evaporator coil, used to judge whether the equipment is moving heat as designed. Cooling systems typically show an 18 to 22 degree Fahrenheit drop; furnaces list an acceptable rise range on the rating plate, often 30 to 60 degrees.
What it means
Temperature split is the difference between return-air and supply-air temperature measured across a furnace heat exchanger or evaporator coil, used to judge whether the equipment is moving heat as designed. Cooling systems typically show an 18 to 22 degree Fahrenheit drop; furnaces list an acceptable rise range on the rating plate, often 30 to 60 degrees. A split outside range flags low airflow, dirty coils, or refrigerant charge problems before they become compressor or heat exchanger failures.
Where it sits in the glossary
Temperature split is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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