Air Duct Cleaning Glossary

This glossary cuts through HVAC jargon so Andover homeowners can confidently discuss air-duct health, energy bills, and system longevity with our meticulous craftsmen. Learn the exact terms you’ll hear during a Nathan Wong inspection—no fluff, just the straight facts you need before you book a white-glove duct clean.

Air ducts quietly move the air you breathe every day in Andover homes. Whether you’re in North Andover’s historic neighborhoods or newer builds in Boxford, understanding these terms helps you spot inefficiencies, improve indoor air, and protect your HVAC investment. Explore our services to see how we tailor each clean to your system’s needs, or contact us for a free, no-pressure estimate before your next service.

SEER rating

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently a central air-conditioner or heat pump cools your home over an entire season. A higher SEER (16 or above) means lower monthly bills and a gentler footprint on Andover’s summer grid. Ask our technicians to check your outdoor unit’s label during your next services visit.

AFUE

AFUE is Annual Fuel Utilization Efficiency, the percentage of fuel your furnace converts to heat instead of waste. A 95 AFUE furnace wastes only 5 cents of every dollar you spend on gas in winter. In older Andover homes with aging systems, upgrading can cut heating costs dramatically—schedule a free efficiency check via contact.

Heat pump

A heat pump moves heat in or out of your home using refrigerant and a reversing valve, delivering both heating and cooling from one compact outdoor unit. Modern cold-climate models keep Andover homes comfortable even when temperatures dip below zero. Ask our team about sizing and SEER/AFUE pairings during your next system review.

Air handler

The air handler is the indoor “blower” that pushes conditioned air through your ductwork. It houses the evaporator coil, blower motor, and air filter. A dirty or failing handler in your Andover home can circulate dust or short-cycle your system. We inspect and clean it during every services visit to keep airflow pristine.

Condenser

The condenser is the outdoor unit that releases heat absorbed from inside your Andover home. It contains the compressor and condenser coil. Leaves, salt spray from Route 28, and summer pollen clog these coils fast; regular coil cleaning prevents efficiency drops and costly repairs.

Evaporator coil

The evaporator coil sits inside the air handler and absorbs heat from indoor air, turning refrigerant from liquid to gas. Over time, mold and dust coat this coil in Andover’s humid summers, reducing cooling power and spreading spores. Our white-glove cleanings include coil sanitization to restore peak performance.

Refrigerant

Refrigerant is the chemical that absorbs and releases heat as it cycles between gas and liquid in your heat pump or AC. Low refrigerant means poor cooling and higher bills. In Andover, leaks often stem from aging copper lines; we pressure-test and top off refrigerant only after a full system inspection.

BTU

BTU stands for British Thermal Unit, the amount of heat needed to raise one pound of water by one degree Fahrenheit. HVAC systems are sized in BTUs per hour; an undersized furnace in a North Andover Victorian will struggle on sub-zero mornings. Our technicians perform a Manual J load calculation to size systems correctly.

Ductwork

Ductwork is the network of metal or flexible tubes that carries conditioned air from your furnace or AC to every room in your Andover home. Leaky or dirty ducts waste 20–30% of energy and circulate allergens. We seal gaps and sanitize ducts during every services clean to restore both comfort and air quality.

Zoning

Zoning divides your Andover home into separate temperature zones controlled by dampers in the ductwork and smart thermostats. Bedrooms upstairs can run cooler than the living room without zoning, but zoning cuts bills by 10–25%. Ask us about retrofitting zoning in homes built before 2000.

MERV rating

MERV is Minimum Efficiency Reporting Value, a scale from 1 to 20 that rates how well an air filter traps particles. A MERV 8 filter catches dust and pollen, while MERV 13 captures viruses and smoke. In Andover’s allergy season, upgrading your filter can drastically improve indoor air—swap it monthly or as recommended.

Load calculation (Manual J)

Manual J is the industry-standard method for calculating how much heating or cooling your Andover home needs based on size, insulation, windows, and local climate. Guessing leads to oversized or undersized systems; we run Manual J before every new install or replacement to guarantee efficiency and comfort.

Thermostat setback

Thermostat setback is programming your thermostat to automatically lower the temperature when you’re asleep or away, then raise it before you wake up. In Andover winters, a 7–10°F nightly setback can cut heating bills by up to 10%. Smart thermostats make setback effortless—ask our team about programmable upgrades during your next services visit.

Short cycling

Short cycling is when your furnace or AC turns on and off too frequently, usually because of a dirty filter, low refrigerant, or an oversized system. In Andover homes, short cycling wastes energy and strains components, leading to early failure. If your system runs for less than 10 minutes per cycle, schedule a diagnostic check via contact.

Plenum

The plenum is the large metal box that connects your air handler to the main supply and return ducts. A leaky plenum in an older Andover home can pull unconditioned attic air into your system, spiking bills and reducing comfort. We pressure-test and seal plenums during every services clean to restore balanced airflow.

HEPA vacuum

A HEPA vacuum uses a high-efficiency particulate air filter to trap 99.97% of particles as small as 0.3 microns during duct cleaning. Our technicians use portable HEPA vacuums to prevent cross-contamination between Andover homes, ensuring a truly clean system every time.

Static pressure

Static pressure is the resistance air encounters as it moves through ducts, filters, and coils. High static pressure forces your blower to work harder, wasting energy and shortening equipment life. In Andover homes with undersized ducts, we measure and correct static pressure during every services visit.

Frequently Asked Questions