Glossary
Sizing & airflow
BTU
British Thermal Unit, the standard measure of heating or cooling energy. One BTU is the energy needed to raise a pound of water one degree Fahrenheit; HVAC equipment is rated in BTUs per hour of output.
Why it matters for your home
BTUs are the currency of system sizing. A furnace might deliver 80,000 BTU/h; an AC's 'tons' translate to 12,000 BTU/h each. The number your home actually needs comes from a Manual J load calculation, and matching that number, not maxing it, is what keeps equipment efficient and comfortable.
See it in context
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