AFUE — Annual Fuel Utilization Efficiency; a furnace's seasonal efficiency, as a percentage.
Air Handler — the indoor unit that moves conditioned air through your ducts, often paired with a heat pump.
BTU — British Thermal Unit; a measure of heating or cooling capacity.
Condenser — the outdoor unit of an AC or heat pump that releases or absorbs heat.
Ductless Mini-Split — a system that heats and cools without ductwork using an outdoor unit and one or more indoor units.
EER2 / SEER2 — measures of cooling efficiency under peak and seasonal conditions, respectively.
Evaporator Coil — the indoor coil that absorbs heat from your home's air.
Heat Pump — a system that both heats and cools by moving heat rather than burning fuel.
HSPF2 — Heating Seasonal Performance Factor; a heat pump's heating efficiency.
Load Calculation — an engineering calculation (Manual J) used to size equipment to a specific home.
NOx — nitrogen oxides; emissions some regions regulate, addressed by low-NOx furnaces.
Ton — a unit of cooling capacity; one ton equals 12,000 BTU per hour.
Two-Stage / Variable-Speed — equipment that can run at reduced capacity for quieter, more efficient, more even comfort.
Zoning — dividing a home into independently controlled comfort areas.
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