Air Duct Cleaning Glossary

This glossary decodes the key Air Duct Cleaning terms every Alloway homeowner should know—especially if your house has original brickwork or older masonry ducts that trap dust and allergens. Learn what these terms mean so you can keep your home’s air clean and your HVAC running smoothly.

If your Alloway home has brick or plaster ducts, seasonal pollen, or an older HVAC system, understanding these air duct cleaning terms will help you make smarter decisions about your indoor air quality. Air Duct Cleaning services can remove decades of dust from masonry ducts, while pricing helps you budget for the work.

SEER rating

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently your cooling system (like a central AC or heat pump) cools your Alloway home over an entire season. A higher SEER means lower energy bills and a smaller carbon footprint. Look for SEER 16 or above for modern systems, but older brick-ducted homes may still run on lower-efficiency units.

AFUE

AFUE is Annual Fuel Utilization Efficiency, a percentage that tells you how much fuel your furnace turns into heat for your Alloway home. An AFUE of 90% means 90 cents of every dollar spent on fuel becomes heat; the rest is lost. Older furnaces in historic homes often dip below 70%, so upgrading can cut heating costs significantly.

Heat pump

A heat pump moves heat in or out of your home using refrigerant and a reversing valve, providing both heating and cooling from one system. In Alloway’s mild but humid climate, a heat pump keeps indoor air comfortable year-round without burning fossil fuels. It’s especially efficient when paired with clean, well-sealed ductwork.

Air handler

The air handler is the indoor part of your HVAC system that circulates air through your home’s ductwork. It houses the blower motor, evaporator coil, and air filter. In older Alloway homes with brick ducts, a clean air handler prevents dust buildup from being pushed into masonry passages.

Condenser

The condenser is the outdoor unit of your AC or heat pump that releases heat from your home into the air. It contains the compressor and condenser coil. Keeping the condenser clear of Alloway’s seasonal debris (like oak leaves and pine needles) ensures your system runs efficiently and avoids short cycling.

Evaporator coil

The evaporator coil sits inside the air handler and absorbs heat from indoor air, turning refrigerant from liquid to gas and cooling your home. Over time, this coil can collect mold and dust, especially in older Alloway homes with brick ducts. A deep clean restores cooling power and improves air quality.

Refrigerant

Refrigerant is the chemical compound that absorbs and releases heat as it cycles through your HVAC system. Older systems may use R-22 (Freon), which is being phased out due to environmental concerns. Modern systems use R-410A or newer, eco-friendly refrigerants. Low refrigerant levels cause poor cooling and can damage your compressor.

BTU

BTU stands for British Thermal Unit, a measure of heat energy. In HVAC terms, it tells you how much heat a system can remove or add per hour. A 3-ton AC unit, for example, removes 36,000 BTUs per hour. For older Alloway homes with thick brick walls, a proper load calculation (Manual J) ensures your system has the right BTU capacity.

Ductwork

Ductwork is the network of pipes or channels that carry heated or cooled air from your HVAC system to every room in your home. In Alloway, many older homes have brick or plaster ducts, which can crack, collect dust, and harbor mold. Cleaning and sealing these ducts improves airflow and indoor air quality.

Zoning

Zoning divides your home into separate temperature-controlled areas using dampers in the ductwork and multiple thermostats. This lets you heat or cool only the rooms you’re using, saving energy in large or multi-story Alloway homes. It’s especially useful in older homes with uneven airflow due to original brick duct layouts.

MERV rating

MERV stands for Minimum Efficiency Reporting Value, a rating that tells you how well an air filter captures particles. A MERV 8 filter traps dust and pollen, while a MERV 13 captures viruses and smoke. For older Alloway homes with brick ducts, a higher MERV filter (11–13) helps reduce dust recirculation from masonry surfaces.

Load calculation (Manual J)

Manual J is the industry-standard method for calculating how much heating or cooling your home needs based on size, insulation, windows, and local climate. A professional load calculation ensures your HVAC system isn’t oversized (wasting energy) or undersized (struggling to keep up). Older Alloway homes with brick walls often need tailored calculations due to their thermal mass.

Thermostat setback

Thermostat setback is a programmable feature that automatically lowers your home’s temperature when you’re asleep or away, then raises it before you wake up or return. In Alloway’s four distinct seasons, setbacks can cut heating and cooling costs by 10–15% while maintaining comfort. Pair it with clean ductwork for best results.

Short cycling

Short cycling happens when your HVAC system turns on and off too frequently, often due to an oversized unit, dirty filters, or refrigerant issues. This strains the system, reduces efficiency, and can leave your Alloway home with uneven temperatures. Clean ductwork and a proper load calculation help prevent short cycling.

Brick duct

Brick duct refers to original masonry air passages found in many older Alloway homes. These ducts are durable but prone to dust buildup, mold growth, and air leaks. A deep clean removes decades of debris, while sealing cracks improves airflow and indoor air quality in historic properties.

Duct liner

Duct liner is a fiberglass or foam material applied inside metal or brick ducts to reduce noise, prevent condensation, and improve insulation. In older Alloway homes, duct liners can degrade over time, trapping dust and mold. Replacing or cleaning liners restores efficiency and air quality.

Frequently Asked Questions