HVAC terms, translated.
The words on your quote, your invoice, and your system's spec sheet — defined in plain English, the way we explain them in your living room.
AFUE (Annual Fuel Utilization Efficiency)
The percentage of fuel a furnace converts into usable heat over a year. A 95% AFUE furnace turns 95¢ of every fuel dollar into heat. Higher AFUE means lower gas bills.
Heating services →Air Handler
The indoor unit that moves conditioned air through your ductwork. It houses the blower motor, evaporator coil, and filter — the 'lungs' of a central HVAC system.
BTU (British Thermal Unit)
The standard measure of heating and cooling energy. One BTU is the energy needed to raise one pound of water 1°F. System capacity is rated in BTUs per hour — bigger homes need more BTUs, but oversizing wastes energy.
Capacitor
A small electrical component that gives motors the jolt they need to start and run. Failed capacitors are one of the most common causes of an AC that hums but won't start — and one of the cheapest fixes.
AC repair →Compressor
The heart of an air conditioner or heat pump. It pressurizes refrigerant so it can move heat out of (or into) your home. Compressor failure is usually the deciding factor in a repair-vs-replace decision.
Condenser / Condenser Coil
The outdoor unit and coil where refrigerant releases the heat collected from inside your home. Dirty condenser coils force the system to work harder — a key item in every tune-up.
Ductless Mini-Split
A heating and cooling system with an outdoor unit and one or more wall-mounted indoor heads — no ductwork required. Ideal for room additions, garages, ADUs, and homes without existing ducts.
Ductless services →Ductwork
The network of sealed channels that distributes conditioned air through your home. Leaky or crushed ducts can waste 20–30% of the air you pay to heat or cool.
Evaporator Coil
The indoor coil where refrigerant absorbs heat from your home's air. A frozen evaporator coil usually points to airflow problems or low refrigerant — not something to keep running.
Heat Exchanger
The furnace component that transfers combustion heat to your home's air while keeping exhaust gases separate. A cracked heat exchanger can leak carbon monoxide — the #1 reason furnace safety inspections matter.
Heating services →Heat Pump
A single system that both cools and heats by moving heat rather than generating it — out of your home in summer, into it in winter. In San Diego's mild climate, heat pumps are among the most efficient options available.
Heat pump services →HERS Testing (Home Energy Rating System)
California-required third-party verification for many HVAC installations — confirming duct sealing, airflow, and refrigerant charge meet Title 24 energy standards.
HSPF (Heating Seasonal Performance Factor)
The heating-mode efficiency rating for heat pumps, measured across a season. Higher HSPF = less electricity per unit of heat.
HVAC
Heating, Ventilation, and Air Conditioning — the whole system that controls temperature, humidity, and air quality in your home.
IAQ (Indoor Air Quality)
A measure of how clean and healthy the air inside your home is — affected by dust, allergens, humidity, VOCs, and ventilation. Filtration, purification, and duct cleaning all target IAQ.
Indoor air quality →Inverter / Variable-Speed
Technology that lets a compressor or blower run at exactly the speed needed instead of just on/off. Variable-speed systems are quieter, more efficient, and hold temperature more evenly.
Load Calculation (Manual J)
The engineering calculation that determines the right system size for your home based on square footage, insulation, windows, and orientation. Skipping it is how systems end up oversized and short-cycling.
MERV Rating
Minimum Efficiency Reporting Value — how well an air filter captures particles, from 1 to 16 for residential use. Higher MERV catches more, but too high for your system can restrict airflow.
Refrigerant (R-410A / R-32 / R-454B)
The working fluid that carries heat through your AC or heat pump. Regulations are phasing older refrigerants toward lower-global-warming options — which affects repair costs on aging systems.
SEER2 (Seasonal Energy Efficiency Ratio)
The cooling-efficiency rating for AC systems and heat pumps under current test standards. Higher SEER2 = lower cooling bills. California minimums are among the strictest in the country.
Air conditioning →Short Cycling
When a system turns on and off rapidly instead of running full cycles. Causes include oversizing, dirty filters, refrigerant problems, or a failing thermostat — and it drives up bills while wearing out parts.
Smart / Programmable Thermostat
A thermostat that adjusts temperature on a schedule or learns your habits. Correctly programmed, it can trim 8–10% off heating and cooling costs.
Static Pressure
The resistance your ductwork puts up against airflow — like blood pressure for your HVAC system. High static pressure means the system strains to breathe, often from undersized ducts or clogged filters.
Title 24
California's building energy-efficiency code. It governs what equipment can be installed, duct-leakage limits, and required verifications on HVAC change-outs in San Diego County.
Ton / Tonnage
A measure of cooling capacity: one ton = 12,000 BTUs per hour. A typical San Diego single-family home needs 2–5 tons, determined by a proper load calculation — not guesswork.
Tune-Up / Precision Maintenance
A scheduled multi-point inspection and cleaning that restores efficiency and catches failures early. The core of the Comfort Club maintenance plans.
Maintenance plans →UV Germicidal Light
An air-quality add-on installed in the ductwork or coil area that uses ultraviolet light to neutralize mold, bacteria, and other biological growth.
Indoor air quality →Zoning / Zone Control
Dividing a home into independently controlled temperature areas using dampers and multiple thermostats — the fix for the classic 'upstairs is hot, downstairs is cold' problem.
Heard a term that's not here?
Ask us — we explain everything we find in plain language, with photos, before any work begins.
Ready for straight answers?
A no-cool emergency at midnight or a planned upgrade — either way, you'll see exactly what we see before you spend a dollar.
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