Air Duct Cleaning Glossary

This quick glossary decodes the 15 most important air-duct and HVAC terms every Georgetown homeowner should know. Clear definitions help you spot inefficiencies, compare quotes, and protect your older home’s masonry ductwork from dust, mold, and hidden damage.

Georgetown’s historic homes often hide original brick-lined ductwork that still carries conditioned air today. Whether you’re upgrading an aging heat pump or simply trying to keep creosote and soot out of your masonry flues, understanding these terms will help you make smarter choices. Learn what SEER, AFUE, and zoning really mean before you compare systems or request your free estimate.

SEER rating

SEER stands for Seasonal Energy Efficiency Ratio. It measures how many BTUs of cooling your air-conditioner delivers for every watt of electricity it uses over an entire season. A higher SEER—typically 14 or above—means lower summer bills and a gentler load on Georgetown’s older duct runs.

AFUE

AFUE, or Annual Fuel Utilization Efficiency, tells you how much of the fuel burned in your furnace actually becomes heat for your home instead of going up the chimney. An AFUE of 90 % means 90 cents of every dollar heats your space; older systems can dip below 70 %. Check your furnace label before winter hits.

Heat pump

A heat pump moves heat rather than creating it, so it can both heat in winter and cool in summer. Modern cold-climate models keep working down to 5 °F, making them ideal for Georgetown’s brisk mornings. They pair perfectly with ductwork that’s been professionally cleaned and sealed.

Air handler

The air handler is the indoor unit that pushes conditioned air through your ductwork. In older Georgetown homes it may sit in a tight attic or basement, so routine duct cleaning keeps dust and insulation fibers from clogging its blower and coil.

Condenser

The outdoor half of a split-system heat pump or air-conditioner, the condenser releases heat absorbed from inside your home. Keep plants and snow cleared within two feet so Georgetown winters don’t force it into short cycling and early failure.

Evaporator coil

Located inside the air handler, the evaporator coil absorbs heat from indoor air as refrigerant flows through it. Over time, mold and dust can coat the coil, lowering efficiency and spreading spores through Georgetown’s older masonry ducts. Annual cleaning helps maintain peak performance.

Refrigerant

Refrigerant is the chemical that absorbs and releases heat as it cycles between the condenser and evaporator coil. Older systems may still use R-22, which is being phased out; newer, eco-friendly refrigerants like R-410A are safer for Georgetown homes and the environment.

BTU

BTU stands for British Thermal Unit, the amount of energy needed to raise one pound of water by one degree Fahrenheit. HVAC systems are sized in thousands of BTUs per hour; an undersized unit in a Georgetown Victorian will short cycle, while an oversized one wastes energy and money.

Ductwork

Ductwork is the network of metal, fiberboard, or even original brick channels that carry heated or cooled air from your furnace or heat pump to every room. In Georgetown’s historic homes, porous masonry ducts can harbor decades of dust, mold, and even creosote from old coal flues—schedule a cleaning to restore airflow and indoor air quality.

Zoning

Zoning divides your home into separate temperature-controlled areas using motorized dampers in the ductwork and individual thermostats. Older Georgetown homes with stubborn hot and cold spots benefit from zoning, which reduces energy waste and strain on your system.

MERV rating

MERV stands for Minimum Efficiency Reporting Value and rates how well an air filter traps particles. A MERV 8 filter catches dust and pollen, while a MERV 13 also traps mold spores and smoke—useful in Georgetown neighborhoods near busy roads or wooded lots. Change filters every season to protect your duct system.

Load calculation (Manual J)

Manual J is the industry-standard method for calculating exactly how much heating and cooling a Georgetown home needs based on size, insulation, window orientation, and even masonry mass. An accurate load calculation prevents oversized equipment that short cycles and wastes energy.

Thermostat setback

Setback is the practice of automatically lowering (or raising) the thermostat when you’re asleep or away to save energy. Programmable or smart thermostats make it easy in Georgetown’s older homes, where thick masonry walls hold heat longer than modern builds.

Short cycling

Short cycling happens when your HVAC system turns on and off too frequently, never reaching full efficiency. It’s common in older Georgetown homes with undersized ductwork or oversized equipment, driving up bills and wearing out parts faster. Call us to inspect your airflow and duct condition.

Creosote

Creosote is a tar-like byproduct of burning wood or coal that coats flue liners and can ignite if allowed to build up. Georgetown homes with original masonry chimneys and ducts are especially vulnerable; regular creosote removal keeps your family safe and your ducts clear.

Masonry duct liner

A masonry duct liner is the original clay-tile or brick channel built into older Georgetown homes to carry warm air. Over time, mortar can crumble and dust accumulates inside. A professional inspection and cleaning preserves airflow and prevents debris from entering your modern HVAC system.

Frequently Asked Questions