Plain-English definitions for the AC, heating and indoor air quality terms you'll hear from any HVAC company on the Emerald Coast — written by the Quincy's team so you know exactly what's being discussed before you approve any work.
Try a different word, or call us at (850) 235-8834 and we'll explain it in person.
Adding refrigerant to an air conditioner that has lost its charge through a leak. A recharge without finding and fixing the leak is a temporary fix — we always look for the leak first.
See AC repair details →Annual Fuel Utilization Efficiency, a rating that shows how much of the fuel a furnace burns turns into usable heat. A 95% AFUE furnace turns 95 cents of every fuel dollar into heat for your home.
See installation details →A split or packaged system that removes heat and humidity from inside your home and moves it outside. On the Emerald Coast, a properly sized, coastal-rated unit is the difference between a system that lasts and one that corrodes early.
See installation details →A filter that traps dust, pollen and debris before air reaches your indoor coil and ductwork. A dirty filter is the single most common cause of an AC that runs constantly or freezes up.
See IAQ details →The indoor part of a split system, containing the blower and evaporator coil. It moves conditioned air through your ductwork and is where most filter and drainage issues show up first.
See AC repair details →The motor that drives the fan inside your air handler, pushing air across the coil and into your ducts. A failing blower motor often sounds like a hum, rattle or squeal before it quits.
See AC repair details →British Thermal Unit, the basic measurement of heat energy. AC and heating systems are sized in BTUs per hour, then converted into tons for cooling equipment.
See installation details →A small electrical component that gives the compressor and fan motors the jolt they need to start and keep running. Capacitors are one of the most common AC failures on the coast, often due to heat and humidity.
See AC repair details →The heart of the air conditioning system — it pressurizes refrigerant and pumps it between the indoor and outdoor coils. A compressor replacement is one of the bigger repairs, and often the point where replacement starts to make more sense.
See AC repair details →The outdoor coil that releases the heat collected from inside your home into the outside air. Salt air speeds up corrosion on condenser coils, which is why regular cleaning matters more here than inland.
See maintenance plan →An electrical switch that turns the outdoor unit's compressor and fan on and off. Pitted or stuck contactors are a frequent cause of a unit that will not start or will not shut off.
See AC repair details →A movable plate inside ductwork that controls how much air flows to a room or zone. Dampers are used to balance airflow so every room gets its fair share of cooling or heating.
See ductwork details →A unit that removes excess moisture from indoor air, either standalone or tied into your ductwork. On the coast, a whole-home dehumidifier helps with musty smells and sticky air your AC alone can't keep up with.
See IAQ details →A heating and cooling system with an outdoor unit connected to one or more indoor wall units, with no ductwork required. Great for additions, garages, or rooms that never feel right with the main system.
See installation details →The network of metal or flexible ducts that carry conditioned air to every room in your home. Leaky, undersized or poorly insulated ductwork is one of the biggest hidden causes of high bills and uneven temperatures.
See ductwork details →A government-backed certification for equipment that meets strict efficiency guidelines. Energy Star qualified systems can also unlock rebates and financing incentives.
See installation details →The indoor coil where refrigerant absorbs heat from the air in your home, cooling and dehumidifying it before it's pushed through your ducts. A dirty or frozen evaporator coil is a common reason a system stops cooling.
See maintenance plan →A heating unit that burns gas or uses electric elements to warm air before it's distributed through your ductwork. Even on the Emerald Coast, a working furnace or heat strip matters for the handful of cold nights each winter.
See heating & repair details →The trade name for R-22, an older refrigerant phased out of new equipment because of its environmental impact. Older systems still using R-22 are a sign it may be time to start planning for a replacement.
See AC repair details →The visible cover over a supply or return air opening in a wall, floor or ceiling. Blocked or closed grilles are an easy, often-overlooked cause of weak airflow in a room.
See ductwork details →The component inside a gas furnace that transfers heat from burning fuel into the air moving through your ducts, without mixing combustion gases into your home's air. A cracked heat exchanger is a safety issue and always needs prompt attention.
See heating & repair details →A single system that both cools your home in summer and heats it in winter by moving heat instead of generating it. Heat pumps are a popular, efficient choice for Florida homes that rarely see hard freezes.
See installation details →A high-efficiency filter that captures very fine particles like pollen, smoke and pet dander. Whole-home HEPA-level filtration can be added to most ductwork systems for households dealing with allergies.
See IAQ details →Heating Seasonal Performance Factor, a rating that measures how efficiently a heat pump produces heat over a typical season. A higher HSPF means lower heating costs for the same comfort.
See installation details →The amount of moisture in the air, which on the Emerald Coast can sit high year-round. A correctly sized AC removes humidity as it cools — an oversized one cools fast but leaves the air damp.
See IAQ details →Short for indoor air quality — the cleanliness, humidity and freshness of the air inside your home. Filtration, humidity control and ductwork all play a part, especially in coastal homes that stay closed up with the AC running most of the year.
See IAQ details →Material that slows heat transfer through attics, walls and ductwork. Good insulation means your AC and heating run less often to hold the temperature you set.
See ductwork details →A short wire used by technicians to test or temporarily bridge connections at the thermostat or control board, often to diagnose whether a problem is in the thermostat itself or further down the line.
See AC repair details →A unit of electrical power equal to 1,000 watts, used to describe the output of electric heat strips and the draw of AC equipment. Your utility bill is calculated in kilowatt-hours, which is kW used over time.
See installation details →A room-by-room analysis of how much heating and cooling a home actually needs, based on size, insulation, windows and orientation. A proper load calculation, not a guess based on the old unit, is how we size a replacement system.
See installation details →Minimum Efficiency Reporting Value, a scale from 1 to 20 that rates how well an air filter captures particles. Higher isn't always better — too high a MERV rating on the wrong system can restrict airflow and stress your equipment.
See IAQ details →An AC or heat pump that can run at more than one capacity level instead of just full-on or full-off. Multi-stage systems run longer at lower output, which improves comfort, humidity control and efficiency.
See installation details →North American Technician Excellence, an industry-recognized certification that tests a technician's real-world HVAC knowledge. NATE-certified techs have proven they understand systems, not just how to swap parts.
See our team →The outdoor cabinet that houses the compressor, condenser coil and outdoor fan. On the coast these work hardest and corrode fastest, which is why outdoor unit cleaning is a core part of our maintenance visits.
See maintenance plan →A thermostat that can be set to automatically change temperature on a schedule, such as warmer while you're away and cooler when you're home. Even a basic programmable thermostat can meaningfully cut cooling costs.
See maintenance plan →An AC or heat pump system with all components — compressor, coils and air handler — housed in a single outdoor cabinet, common on homes without attic space for an indoor air handler.
See installation details →A measure, usually in decibels, of how much noise an outdoor unit makes while running. Newer variable-speed systems run noticeably quieter than older single-stage units, which matters on tight coastal lots.
See installation details →The fluid that circulates through your AC's coils, absorbing heat indoors and releasing it outdoors. A system that's low on refrigerant has a leak somewhere — adding more without finding the leak just delays the same repair.
See AC repair details →The path air takes back to your air handler to be filtered and conditioned again, usually through one or more large grilles. A return that's too small or blocked can starve the whole system of airflow.
See ductwork details →The refrigerant used in most residential AC systems installed over the past two decades, replacing older R-22. It's itself being phased down in favor of newer, lower-impact refrigerants in upcoming equipment.
See AC repair details →Seasonal Energy Efficiency Ratio, the standard rating for how efficiently an AC or heat pump cools over a season. SEER2 is the updated testing standard for new equipment — higher numbers mean lower cooling costs for the same size home.
See installation details →When a system turns on and off in rapid, short bursts instead of running a normal cycle. It's often caused by an oversized unit, a refrigerant issue, or a bad thermostat sensor, and it wears equipment out faster.
Read our short cycling guide →A Wi-Fi connected thermostat that learns your schedule, can be controlled from your phone, and often tracks energy use. Pairing one with a properly sized system is where the real savings show up.
See maintenance plan →The most common residential setup, with an outdoor condensing unit connected by refrigerant lines to an indoor air handler or furnace. Most homes on the Emerald Coast use a split system for cooling and heating.
See installation details →The control that reads your home's temperature and tells your HVAC system when to run. Even a well-matched system can underperform if the thermostat is miscalibrated or poorly placed.
See maintenance plan →A unit of cooling capacity equal to 12,000 BTUs per hour. Residential systems typically range from 1.5 to 5 tons — bigger isn't always better, the right tonnage comes from a load calculation, not square footage alone.
See installation details →A device installed in your ductwork or air handler that uses ultraviolet light to reduce mold, bacteria and odors on your coil and in passing air. Popular in humid coastal climates where coils stay damp.
See IAQ details →A blower or compressor motor that adjusts its speed to match the exact heating or cooling demand, instead of running at one fixed speed. The result is steadier temperatures, better humidity control and quieter operation.
See installation details →The movement of fresh air into and stale air out of your home. Good ventilation, balanced against a tightly sealed coastal home, helps prevent the stuffy or musty feeling many homeowners fight.
See ductwork details →Gases released by paints, cleaners, furniture and other household materials that can affect indoor air quality. Filtration and ventilation both help reduce VOC buildup inside a closed-up home.
See IAQ details →A dehumidifier installed directly into your ductwork that controls humidity for the entire house, rather than one room at a time. A common addition for coastal homes fighting year-round stickiness.
See IAQ details →A self-contained air conditioner that fits in a window or wall opening, cooling a single room. Often used as a backup or for spaces a central system doesn't reach well.
See AC repair details →The thermostat wire and terminal that signals the outdoor unit's compressor to start cooling. If your thermostat calls for cooling but the outdoor unit never kicks on, a tech will often start by checking the Y-wire connection.
See AC repair details →A setup that divides your home into separate areas, each with its own thermostat and dampers, so different rooms can be different temperatures. Popular for two-story coastal homes where upstairs always runs hotter.
See ductwork details →